function checkform(elementID) {

		var day = document.forms[elementID].depDay.options[document.forms[elementID].depDay.selectedIndex].value
		var month = document.forms[elementID].dMonth.options[document.forms[elementID].dMonth.selectedIndex].value
		var year = document.forms[elementID].dYear.options[document.forms[elementID].dYear.selectedIndex].value

		var dateString = year+'/'+month+'/'+day;
		var myDate = new Date(dateString);
		var weekday=new Array(7);
		weekday[0]="Sunday";
		weekday[1]="Monday";
		weekday[2]="Tuesday";
		weekday[3]="Wednesday";
		weekday[4]="Thursday";
		weekday[5]="Friday";
		weekday[6]="Saturday";

		var today=new Date()
		var date1=new Date(year+'/'+month+'/'+day);

		if(elementID==="pk"){
			if(document.forms[elementID].destination.selectedIndex == 0){
				alert("Please select a destination");
				return(false);
			}else if(document.forms[elementID].from.selectedIndex == 0){
				alert("Please select a departure airport");
				return(false);
			}else if(date1<=today){
				alert("Please select a date in the future");
				return(false);
			} else if(weekday[myDate.getDay()]!="Tuesday" && document.forms[elementID].destination.value=="MLA" && (document.forms[elementID].from.value=="EXT" || document.forms[elementID].from.value=="NWI" || document.forms[elementID].from.value=="CWL")){
				alert("Your chosen airport only operates a chartered flight to Malta on a Tuesday\n\nPlease re-select");
				return(false);
			} else if(weekday[myDate.getDay()]!="Monday" && document.forms[elementID].destination.value=="FNC" && (document.forms[elementID].from.value=="BHX" || document.forms[elementID].from.value=="BOH" || document.forms[elementID].from.value=="CWL" || document.forms[elementID].from.value=="EDI" || document.forms[elementID].from.value=="EXT" || document.forms[elementID].from.value=="GLA" || document.forms[elementID].from.value=="LTN" || document.forms[elementID].from.value=="MAN")){
				alert("Your chosen airport only operates a chartered flight to Madeira on a Monday\n\nPlease re-select");
				return(false);
			}else if(document.forms[elementID].r1ad.value == 1 & document.forms[elementID].r1ch.value > 0){
				alert("Room 1: Occupancy rules restrict children from sharing with a single adult.");
				return(false);
			}else if(document.forms[elementID].r2ad.value == 1 & document.forms[elementID].r2ch.value > 0){
				alert("Room 2: Occupancy rules restrict children from sharing with a single adult.");
				return(false);
			}else if(document.forms[elementID].r3ad.value == 1 & document.forms[elementID].r3ch.value > 0){
				alert("Room 3: Occupancy rules restrict children from sharing with a single adult.");
				return(false);
			}else if(document.forms[elementID].optout.checked==true){
				if(document.forms[elementID].semail.value.length==0 && echeck(document.forms[elementID].semail.value)==false){
					alert("Please provide your email address to continue your availability search.");
					return(false);
				}
			}else{
				$(document).ready(function() {
					$.blockUI({ message: $('#pkload') });
					document.getElementById('pkloader').innerHTML = '<img src=\'/images/loader.gif\' border=\'0\' />';
				});
			}
		}

		if(elementID==="ao"){
			if(document.forms[elementID].destination.selectedIndex == 0){
				alert("Please select a destination");
				return(false);
			}else if(date1<=today){
				alert("Please select a date in the future");
				return(false);
			}else if(document.forms[elementID].r1ad.value == 1 & document.forms[elementID].r1ch.value > 0){
				alert("Room 1: Occupancy rules restrict children from sharing with a single adult.");
				return(false);
			}else if(document.forms[elementID].r2ad.value == 1 & document.forms[elementID].r2ch.value > 0){
				alert("Room 2: Occupancy rules restrict children from sharing with a single adult.");
				return(false);
			}else if(document.forms[elementID].r3ad.value == 1 & document.forms[elementID].r3ch.value > 0){
				alert("Room 3: Occupancy rules restrict children from sharing with a single adult.");
				return(false);
			}else if(document.forms[elementID].optout.checked==true){
				if(document.forms[elementID].semail.value.length==0 && echeck(document.forms[elementID].semail.value)==false){
					alert("Please provide your email address to continue your availability search.");
					return(false);
				}
			}else{
				$(document).ready(function() {
					$.blockUI({ message: $('#aoload') });
					document.getElementById('aoloader').innerHTML = '<img src=\'/images/loader.gif\' align=\'absmiddle\' border=\'0\' />';
				});
			}
		}

		if(elementID==="fo"){
			if(document.forms[elementID].destination.selectedIndex == 0){
				alert("Please select a destination");
				return(false);
			}else if(date1<=today){
				alert("Please select a date in the future");
				return(false);
			}else if(document.forms[elementID].r1ad.value == 1 & document.forms[elementID].r1ch.value > 0){
				alert("Room 1: Occupancy rules restrict children from sharing with a single adult.");
				return(false);
			}else if(document.forms[elementID].optout.checked==true){
				if(document.forms[elementID].semail.value.length==0 && echeck(document.forms[elementID].semail.value)==false){
					alert("Please provide your email address to continue your availability search.");
					return(false);
				}
			}else{
				$(document).ready(function() {
					$.blockUI({ message: $('#foload') });
					document.getElementById('foloader').innerHTML = '<img src=\'/images/loader.gif\' align=\'absmiddle\' border=\'0\' />';
				});
			}
		}

	}