function updatedate(elem){
	for (var i = document.forms[0].date.options.length; i >= 0; i--) document.forms[0].date.options[i] = null;
	if (elem.selectedIndex != -1){
		if (elem.options[elem.selectedIndex].value == 'M'){
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Please select...","");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Saturday 4th September","2010-09-04");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Sunday 5th September","2010-09-05");
		}
		if (elem.options[elem.selectedIndex].value == 'T'){
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Please select...","");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Saturday 11th September","2010-09-11");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Sunday 12th September","2010-09-12");
		}
		if (elem.options[elem.selectedIndex].value == 'E'){
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Please select...","");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Saturday 25th September","2010-09-25");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Sunday 26th September","2010-09-26");
		}
		if (elem.options[elem.selectedIndex].value == 'B'){
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Please select...","");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Saturday 2nd October","2010-10-02");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Sunday 3rd October","2010-10-03");
		}
		if (elem.options[elem.selectedIndex].value == 'L'){
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Please select...","");	
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Saturday 23rd October","2010-10-23");
			document.forms[0].date.options[document.forms[0].date.options.length] = new Option("Sunday 24th October","2010-10-24");
		}

	}
}
function updatesession(elem){
	for (var i = document.forms[0].session.options.length; i >= 0; i--) document.forms[0].session.options[i] = null;
	if (elem.selectedIndex != -1){
		if (elem.options[elem.selectedIndex].value == '2010-09-04'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 2.00pm - tickets 6.00 each","MS1A");
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 2: 3.00pm - 7.00pm - SOLD OUT","");			
		
		  var sels = document.getElementById('session');
			sels.options[1].disabled = true;
			
			sels.onchange= function(){ 
				if(this.options[this.selectedIndex].disabled){
					if(this.options.length<=1){
						this.selectedIndex = -1;
					}else if(this.selectedIndex < this.options.length - 1){
						this.selectedIndex++;
					}else{
						this.selectedIndex--;
					}
				}
			}
		
		}
		if (elem.options[elem.selectedIndex].value == '2010-09-05'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 5.00pm - tickets 10.00 each","MS3A");
		}
		
		
		if (elem.options[elem.selectedIndex].value == '2010-09-11'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 5.00pm - tickets 10.00 each","TS1A");
		} 
		
		if (elem.options[elem.selectedIndex].value == '2010-09-12'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 5.00pm - tickets 10.00 each","TS2A");
		} 
		
		
		if (elem.options[elem.selectedIndex].value == '2010-09-25'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00pm - 5.00pm - tickets 10.00 each","ES1A");
		}
		if (elem.options[elem.selectedIndex].value == '2010-09-26'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 12.30pm - 5.00pm - tickets 10.00 each","ES2A");
		}
		
		
		if (elem.options[elem.selectedIndex].value == '2010-10-02'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 2.00pm - tickets 6.00 each","BS1A");
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 2: 3.00pm - 7.00pm - tickets 10.00 each","BS2A");
		}
		if (elem.options[elem.selectedIndex].value == '2010-10-03'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 5.00pm - tickets 10.00 each","BS3A");
		}
		
		if (elem.options[elem.selectedIndex].value == '2010-10-23'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 2.00pm - tickets 6.00 each","LS1A");
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 2: 3.00pm - 7.00pm -  tickets 10.00 each","LS2A");
		}
		if (elem.options[elem.selectedIndex].value == '2010-10-24'){
			document.forms[0].session.options[document.forms[0].session.options.length] = new Option("Session 1: 11.00am - 5.00pm - tickets 10.00 each","LS3A");
		}
	}
}

function activateOptionsDisabled(){
	var sels = document.getElementsByTagName('select');
    for(var i=0; i < sels.length; i++){
        sels[i].onchange= function(){ 
            if(this.options[this.selectedIndex].disabled){
                if(this.options.length<=1){
                    this.selectedIndex = -1;
                }else if(this.selectedIndex < this.options.length - 1){
                    this.selectedIndex++;
                }else{
                    this.selectedIndex--;
                }
            }
        }
        if(sels[i].options[sels[i].selectedIndex].disabled){
            sels[i].onchange();
        }    
        for(var j=0; j < sels[i].options.length; j++){ 
            if(sels[i].options[j].disabled){
                sels[i].options[j].style.color = '#7F7F7F';
            }
        }
    }
}

$(document).ready(function(){
	$('#venue').change(function(){
		$('#session').html('<option>Please select...</option>');
	});
	
	$('form.form-a select').change(function(){
		$('form.form-a div.info').hide();
		if ($('#session').val() != '' && $('#session').val() != 'Please select...'){
			$('#'+$('#session').val()).show()
		}
	});
	$('form.form-a div.masterclass a').click(function(){
		$('div.info').hide();
	});
	$('form.form-a').submit(function(){
		if($('#quantity').val() == ''){
			alert('Please enter numer of tickets');
			return false;
		}		
		if($('#quantity').val() < masterclass){
			alert('Too many masterclass tickets entered');
			return false;
		}
	});
});