function checkFastTrack() {
    var why = "";
	
	if (document.getElementById('startDate').options[document.getElementById('startDate').selectedIndex].value == '') {
	why += "You must select a start date\n";
	}
	
	if (document.getElementById('startMonth').options[document.getElementById('startMonth').selectedIndex].value == '') {
	why += "You must select a start month\n";
	}
	
	var members = document.booking.members.options[document.booking.members.selectedIndex].value;
	
	for (var i = 1; i <= members; i++) {
		if (document.getElementById('name'+i).value == '') {
		why += "\nYou must complete the following details for member "+i+"\n or else change the number of members in your group using the selection box marked 'members'\n\n";
		why += "You must enter a name for member "+i+"\n";
		}
		if (document.getElementById('dobDay'+i).value == '' || document.getElementById('dobDay'+i).value.length != 2) {
			why += "You must enter a 2 digit Day for date of birth\n";
		}
		
		if (document.getElementById('dobMonth'+i).value == '' || document.getElementById('dobMonth'+i).value.length != 2) {
			why += "You must enter a 2 digit Month for date of birth\n";
		}
		
		if (document.getElementById('dobYear'+i).value == '' || document.getElementById('dobYear'+i).value.length != 4) {
			why += "You must enter a 4 digit Year for date of birth\n";
		}
		if (document.getElementById('ability'+i).options[document.getElementById('ability'+i).selectedIndex].value == '') {
		why += "You must select an ability for member "+i+"\n";
		}
		if (document.getElementById('equipment'+i).options[document.getElementById('equipment'+i).selectedIndex].value == '') {
		why += "You must select equipment for member "+i+"\n";
		}
		if (document.getElementById('sizeChosen'+i).options[document.getElementById('sizeChosen'+i).selectedIndex].value == '') {
		why += "You must select a size for member "+i+"\n";
		}
		if (document.getElementById('height'+i).options[document.getElementById('height'+i).selectedIndex].value == '') {
		why += "You must select a height for member "+i+"\n";
		}
		if (document.getElementById('weight'+i).options[document.getElementById('weight'+i).selectedIndex].value == '') {
		why += "You must select a weight for member "+i+"\n";
		}
		if (document.getElementById('duration'+i).options[document.getElementById('duration'+i).selectedIndex].value == '') {
		why += "You must select rental days for member "+i+"\n";
		}
	}
	
	
    if (why != "") {
       alert(why);  
       //return false;
    }
	else {
		// submit the form
		document.booking.submit();
	}
	
}