function Calendar (myPay) {
		
	// initialize the member variables for this instance
	var state_elm = '';
	var elm_num = '';
	var special_state = '';
	var update_prices = '';
    var total_products = '';
    var all_product_calendars_exist = true;
    var calendars_exist = true;
    var maximum_heights_set = false;
    
    pay=myPay;
	pay_tab = false;
	
	// initialize the member function references
	this.get_products=get_products; 
    this.get_price_breakdown=get_price_breakdown;
	this.get_total_price_info=get_total_price_info;
    //this.check_calendars_written=check_calendars_written;
    this.display_calendars=display_calendars;
    this.set_heights=set_heights;
	this.select_calendar=select_calendar;
	this.get_calendar=get_calendar;
	this.get_calendar_body=get_calendar_body;
    this.check_all_product_calendars_exist=check_all_product_calendars_exist;
    this.check_calendars_exist=check_calendars_exist;
    this.show_hide_product_select=show_hide_product_select;
    this.display_calendar=display_calendar;
	this.update_calendar=update_calendar;
	this.set_select_to_default=set_select_to_default;
	this.get_calendar_key=get_calendar_key;
	this.update_price=update_price;
	this.modify_availability=modify_availability;
	this.reset_state=reset_state;
	this.what_key=what_key;
	
	function get_products() {
		var newURL= 'http://www.rocklandsboulders.com/bookings/get_product_select';
		jQuery.ajax ({
			data: "",			
			type: "POST",
			url: newURL,
			success: function(data){
				$('#calendar-div-left').prepend(data);
				select_calendar('product_select');
			}
		})
	}
    
    function get_price_breakdown() {
		var newURL= 'http://www.rocklandsboulders.com/bookings/get_price_breakdown';
		jQuery.ajax ({
			data: "",			
			type: "POST",
			url: newURL,
			success: function(data){
            	if ($('#cal-key-holder').attr('id') == 'cal-key-holder') {
                	$('#calendar-div-right').prepend(data);
                }
                else {
                	$('#calendar-div-right').append(data);
                }
			}
		})
	}

	
	function get_total_price_info() {
    	maximum_heights_set = false;
    	var complete = false;
		//$('#overlay').fadeIn("medium",function(){
        	//$('<img>').attr('id', 'booking_system_loader').attr('src', 'http://www.rocklandsboulders.com/images/booking_system_loader.gif').attr('style','left:525px;top:230px;position:absolute;z-index:100;').appendTo('#main-container');
			var newURL= 'http://www.rocklandsboulders.com/bookings/get_total_price_info';
			jQuery.ajax ({
				data: "",			
				type: "POST",
				url: newURL,
				success: function(data){
                	//tabs
                    $('#tabs > ul').tabs();
                    $('#avail_link').focus();
                 	$('#pay_link').click(function () {
                    	pay=myPay;
                    	pay.display_pay();
                        pay_tab = true;
                    });
                    $('#avail_link').click(function () {
                    	pay_tab = false;
                    });
                    $('#details_link').click(function () {
                    	pay_tab = false;
                    });
                    $('#price_link').click(function () {
                    	pay_tab = false;
                    });
                    $('#contact_link').click(function () {
                    	pay_tab = false;
                    });
					data=data.split('&/&/&/&/&');
					var total_price_info=data[data.length-1];
        			$('<div>').attr('id', 'all-calendar-info').appendTo('#fragment-1');
					$('#all-calendar-info').prepend(total_price_info);
                    $('<div>').attr('id', 'calendar-div-left').attr('class', 'fl').appendTo('#all-calendar-info');
                    $('<div>').attr('id', 'calendar_holder').attr('class', 'holder').attr('style', 'margin-left:0;').appendTo('#calendar-div-left');
        			$('<div>').attr('id', 'calendars').attr('style', 'visibility:hidden;').appendTo('#calendar_holder');
                    $('<div>').attr('id', 'calendar-div-right').attr('class', 'fl').appendTo('#all-calendar-info');
                    total_products=data[0];
                    total_products=total_products.replace('total_products=','');
                    num_products=data[data.length-2];
                    num_products=num_products.replace('count_products=','')
                    get_products();
                    get_price_breakdown();
                    if (num_products == 0) {
                        $('#booking_system_loader').remove();
            			$('#tabs').fadeIn('slow');
                    }
                    else {
                        product_calendar_array=new Array();
                        for (var i=1; i<=num_products; i++) {
                            var product_details=data[i].split('&');
                            var product_id=product_details[0];
                            product_id=product_id.replace('product_id=','');
                            if ((product_details.length) > 2) {
                                for (var j=(product_details.length-1); j>0; j--) {
                                    var item_id=product_details[j];
                                    item_id=item_id.replace('item_id=','');
                                    if (j==(product_details.length-1)) {
                                        get_calendar(product_id, item_id);                                   
                                    }
                                    else {
                                        update_calendar(product_id, item_id);
                                    }
                                }
                            }
                            else {
                                item_id=product_details[1];
                                item_id=item_id.replace('item_id=','');
                                get_calendar(product_id, item_id);
                           }
                           product_calendar_array.push(product_id);
                        }
                        if (i-1 == num_products) {
                            display_calendars(product_id, product_calendar_array)
                        }
                    
					}
                 }
			})
		//});
	}
    
    function display_calendars(product_id, product_calendar_array) {
    	var t=setInterval(function(){
        	if ($('#calendar_body_'+ product_id).children('td').length == 3) {
                for (var c=0; c<product_calendar_array.length; c++) {
                    $('#'+product_calendar_array[c]).css('display', 'block');
                    $('#option_'+product_calendar_array[c]).remove();
                }	
                $('#booking_system_loader').remove();
                $('#calendars').css('visibility', 'visible'); 
                $('#tabs').fadeIn('slow');
                set_heights(true);
                clearInterval(t);
        	}
        },500);    
    }
    
    function set_heights(first_run) {
       if (maximum_heights_set == false) {
            //get height of tabs div
            var tabs_height=$('#tabs').height();
            
            //get height of tabs top
            var tabs_top=$('#tabs').css('top');
            tabs_top=tabs_top.replace('px', '');
            
            //old overlay height
            var overlay_height=$('#overlay').height();
            //new overlay height
            var new_overlay_height=parseInt(tabs_height) + parseInt(tabs_top) +parseInt(10);
            
            //get tabs list height
            var tabs_list_height=$('#tabs_list').height();
              
            //old fragment height
            var fragment_1_height= $('#fragment-1').height();  
            //new fragement height
            var new_fragment_1_height = tabs_height-tabs_list_height;
            
            //old calendar height
            var calendars_height=$('#calendars').height();

            if (first_run == true) {
                //set overlay height
                if (new_overlay_height > overlay_height) {
                    $('#overlay').css('height', new_overlay_height);
                }
                //set fragment-1 height
                if (new_fragment_1_height > fragment_1_height) {
                    $('#fragment-1').css('height', fragment_1_height);
                }
                //set calendar height
                $('#calendars').css('height', calendars_height);
            }
            else {
                //get height of calendar table
                product_calendar_height=$('table.cal-header').css('height');
                product_calendar_height=product_calendar_height.replace('px', '');
                product_calendar_height=parseInt(product_calendar_height);
                
                overlay_height=overlay_height+product_calendar_height;
                fragment_1_height=fragment_1_height+product_calendar_height;
                calendars_height=calendars_height+product_calendar_height;
                //set overlay height
                $('#overlay').css('height', overlay_height);
                
                //set fragment-1 height
                $('#fragment-1').css('height', fragment_1_height);
                
                //set calendar height       
                $('#calendars').css('height', calendars_height);
            } 
    		if (check_all_product_calendars_exist()) {
        		maximum_heights_set = true;
        	}
        }
    }
    
	function select_calendar(select_id) {
    	$('#'+select_id).unbind('change');
		$('#'+select_id).change(function(){
			var item_id="";
			var product_id=$('#'+select_id).val();	
            if ($('#product-select-div').css('display') == 'block') {

				if ($('#'+product_id).attr('id') != product_id) {
            		$('#product_select').fadeOut('fast', function () {
                       	$('#product-select-status').html('loading...');
                        $('#product-select-status').fadeIn('fast', function () {
                            calendars_exist=check_calendars_exist();
                            get_calendar(product_id, item_id); 
                            display_calendar(product_id, calendars_exist);   
                        });              
                    }); 
                }
            }
            
            set_select_to_default(select_id, product_id);
		});
	}
	
	function get_calendar(product_id, item_id) {
		if ($('#'+product_id).attr('id')!= product_id) {
			var newURL= 'http://www.rocklandsboulders.com/bookings/get_cal_head';
			jQuery.ajax ({
				data: "product_id="+product_id+"&item_id="+item_id+"",			
				type: "POST",
				url: newURL,
				success: function(data){
					if ($('#cal-key').attr('id') != 'cal-key') {
                    	get_calendar_key();                       
                        $('#calendars').append(data);
                        get_calendar_body(product_id, item_id);
					}
                    else {
                    	$('#calendars').append(data);
                        get_calendar_body(product_id, item_id);
                    }				
				}
			})
		}
	}
    
	function get_calendar_body(product_id, item_id) {
		var newURL= 'http://www.rocklandsboulders.com/bookings/get_cal';
		jQuery.ajax ({
			data: "product_id="+product_id+"&item_id="+item_id+"&bookings_table=bookings_calendar",			
			type: "POST",
			url: newURL,
			success: function(data){
				data=data.split('&/&/&/&/&');
				var calendar=data[5];
				var split_data=new Array();
				for (var i=0; i<data.length-1; i++) {
					split_data[i]=data[i].split('=');
				}
				var product_id=split_data[0][1];
				var product_name=split_data[1][1];
				var item_id=split_data[2][1];
				var item_name=split_data[3][1];
				var price=split_data[4][1];
				update_price(product_id, product_name, item_id, item_name, price, '');
				$('#calendar_body_'+product_id).prepend(calendar);
			}
		})
	}
	
    function check_all_product_calendars_exist() {
    	all_product_calendars_exist = true;
    	for (var c=1; c<=total_products; c++) {
        	if ($('#'+c).attr('id') != c) {
        		all_product_calendars_exist = false;
        	}
        }
        show_hide_product_select();
        if (all_product_calendars_exist == true) {
        	return true;
        }
    }
    
    function check_calendars_exist() {
    	for (var c=1; c<=total_products; c++) {
        	if ($('#'+c).attr('id') == c) {
                return true;
        	}
        }
        return false;
    }
    
    
    function show_hide_product_select() {
        if (all_product_calendars_exist == true) {
        	$('#product_select').fadeOut('fast', function() {
            	$('#product-select-status').html('all mats selected');
                $('#product-select-status').fadeIn('fast');
            });
         }
        else {
        	$('#product-select-status').fadeOut('fast', function() {
            	$('#product-select-status').html('');
            	$('#product_select').fadeIn('fast');
            });
        }
    }
    
    function display_calendar(product_id) {
    	var t=setInterval(function(){
            if ($('#calendar_body_'+product_id).children('td').length == 3) {
            //if ($('#calendar_body_'+product_id).attr('id')== 'calendar_body_'+product_id) {
                $('#product-select-status').fadeOut('fast', function() {
                    $('#product-select-status').html('');
                    $('#product_select').fadeIn('fast');
                    $('#'+product_id).fadeIn('fast', function() {
                        if (maximum_heights_set == false) {
                            $('#calendars').css('visibility', 'visible');
                            if (calendars_exist == true) {
                                set_heights(false);
                            }
                            else {
                                if ($('#calendars').children('table').length == 1) {
                                    set_heights(true);
                                }
                            }
                        }
                        else {
                            check_all_product_calendars_exist();
                        }
                    });
                }); 
            clearInterval(t);  
            }
        },500);  
    }
    
    
    
	function update_calendar(product_id, item_id) {         
		if (item_id == '') {
			var item_id= $('#product_'+product_id+'_select').val();
		}
        $('#product_'+product_id+'_select').fadeOut('fast', function(){
            $('#item_calendar-select').fadeIn('fast');
            var newURL= 'http://www.rocklandsboulders.com/bookings/get_cal';
            jQuery.ajax ({
                data: "product_id="+product_id+"&item_id="+item_id+"&bookings_table=bookings_calendar",			
                type: "POST",
                url: newURL,
                success: function(data){
                    data=data.split('&/&/&/&/&');
                    var calendar=data[5];
                    var split_data=new Array();
                    for (var i=0; i<data.length; i++) {
                        split_data[i]=data[i].split('=');
                    }
                    var product_id=split_data[0][1];
                    var product_name=split_data[1][1];
                    var item_id=split_data[2][1];
                    var item_name=split_data[3][1];
                    var price=split_data[4][1];
                    $('#calendar_body_'+product_id).html(calendar);
                    $('#item_calendar-select').fadeOut('fast', function () {
                    	$('#loading_'+item_id+'_cal').html('');
                        $('#product_'+product_id+'_select').fadeIn('fast');
                        update_price(product_id, product_name, item_id, item_name, price, '');
                        $('#product_'+product_id+'_item_'+item_id+'_option').attr('selected', 'selected');
                    });
                }
            })
         });
	}
	
	function set_select_to_default(select_id, product_id) {
		//set select to default value
        $('#product_select').blur();
        $('#option_'+product_id).blur();
		$('#'+select_id+'_default').attr('selected', 'selected');
        $('#option_'+product_id).remove();
	}
	
	function get_calendar_key() {
    	$('<div>').attr('id', 'cal-key-holder').attr('class', 'holder').appendTo('#calendar-div-right');
        $('<table>').attr('id', 'cal-key').appendTo('#cal-key-holder');
        $('<thead>').attr('id', 'cal-key-head').appendTo('#cal-key');
        $('<tr>').attr('id', 'cal-key_head_row').appendTo('#cal-key-head');
        $('<th>').attr('id', 'cal-key_head_cell').attr('class', 'cal-key').appendTo('#cal-key_head_row');
        $('#cal-key_head_cell').html('<p class="table-text-holder" style="margin:0;">calendar key</p>');
        $('<tbody>').attr('id', 'cal-key_body').appendTo('#cal-key');
        $('<tr>').attr('id', 'cal-key_body_row').attr('class', 'cal-key').appendTo('#cal-key_body');
        $('<td>').attr('id', 'cal-key_table_cell').appendTo('#cal-key_body_row');
		$('#cal-key_table_cell').html('<p class="table-text-holder" style="padding-top:4px;"><img style="vertical-align:middle;" src="http://www.rocklandsboulders.com/images/available.jpg" alt="available" /><span class="table-text-holder">available</span></p>');
        $('<tr>').attr('id', 'cal-key_body_row_2').attr('class', 'cal-key').appendTo('#cal-key_body');
        $('<td>').attr('id', 'cal-key_table_cell_2').appendTo('#cal-key_body_row_2');
        $('#cal-key_table_cell_2').html('<p class="table-text-holder"><img style="vertical-align:middle;" src="http://www.rocklandsboulders.com/images/booked.jpg" alt="booked" /><span class="table-text-holder">booked</span></p>');
          $('<tr>').attr('id', 'cal-key_body_row_3').attr('class', 'cal-key').appendTo('#cal-key_body');
        $('<td>').attr('id', 'cal-key_table_cell_3').appendTo('#cal-key_body_row_3');
        $('#cal-key_table_cell_3').html('<p class="table-text-holder"><img style="vertical-align:middle;" src="http://www.rocklandsboulders.com/images/temp.jpg" alt="temp booked by you" /><span class="table-text-holder">temp booked by you</span></p>');
        
    }
	
	function update_price (product_id, product_name, item_id, item_name, price, total_price){
        price=parseFloat(price);
        price=price.toFixed(2);
		$('#pb_product_'+product_id+'_item_'+item_id).html(''+item_name+':  &pound;'+price+'');
  		if (total_price != '') {
        	total_price=parseFloat(total_price);
            total_price=total_price.toFixed(2);
			$('#para_total_price').html('Your total price is now at &pound;'+total_price+'');
            $('#para_total_price').fadeIn('fast');
		}
	}
	
	function modify_availability(product_id, id_item, date, the_num, e, temp_table_name){	
		//catch key press
		var special_state="";
		var the_key= what_key(e);
		if (the_key!="ko") {
			special_state=the_key;
		}
        if ($('#modify_'+date).attr('id') != 'modify_'+date+'') {
            //set up ajax 
            $('#item_'+id_item+'_link_'+date).css('display', 'none');
            $('<img>').attr('id', 'modify_'+date+'').attr('src', 'http://www.rocklandsboulders.com/images/calendar-loader.gif').attr('alt','loading').appendTo('#item_'+id_item+'_row_'+date+'');
            var newURL= 'http://www.rocklandsboulders.com/bookings/update_cal';
            jQuery.ajax ({
                data: "product_id="+product_id+"&id_item="+id_item+"&the_date="+date+"&temp_table_name="+temp_table_name,			
                type: "POST",
                url: newURL,
                success: function(data){
                    data=data.split('&/&/&/&/&');
                    var split_data=new Array();
                    for (var i=0; i<data.length; i++) {
                        split_data[i]=data[i].split('=');
                    }
                    var state=split_data[0][1];
                    var date=split_data[1][1];
                    var product_id=split_data[2][1];
                    var product_name=split_data[3][1];
                    var item_id=split_data[4][1];
                    var item_name=split_data[5][1];
                    var price=split_data[6][1];
                    var total_price=split_data[7][1];
                    reset_state(state, date, item_id);
                    update_price(product_id, product_name, item_id, item_name, price, total_price)
                }
            });	
         }	
	}
	
	function reset_state(state, date, item_id){
		if (state=="on" || state=="off" ){
			if (date.indexOf('0') == '0' ) {
				date=date.replace('0', '');
			}
			$('#item_'+item_id+'_state_'+date).html(date);
			if (state=="on") {
				$('#item_'+item_id+'_row_'+date).attr('class', 'days-temp-booked');
			}
			else if (state=="off") {
				$('#item_'+item_id+'_row_'+date).attr('class', 'days-avail');
			}
		}
        $('#modify_'+date).fadeOut('fast',function() {
        	$('#modify_'+date).remove();
        	$('#item_'+item_id+'_link_'+date).css('display', 'block');
        });
	}
	
	function what_key(e) {
	   if(document.all)e = event; // IE need this
			if(e.ctrlKey)		return "pm";
			else if(e.altKey)	return "am";
			else return "ko";
	}
}