function switchLayers(element){
				
				if(element == "articles"){
					document.getElementById('keywordSelect').style.display = "none";
					document.getElementById('key1').value = "Keyword one";
					document.getElementById('key2').value = "Keyword two";
					document.getElementById('key3').value = "Keyword three";
					return false;
				}
				else if(element == "keywords"){
					document.getElementById('keywordSelect').style.display = "block";
					return false;
				}
			}
			
			function validateAlert(){
				var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
				var chkd = 0;
				
				if(document.getElementById('name').value == ""){
					alert("You have not entered your name");
					document.getElementById('name').focus();
					return false;
				}
				if(!filter.test(document.getElementById('email').value)){
					alert("You have not entered your email address");
					document.getElementById('email').focus();
					return false;
				}
				for(i=0; i<document.alertForm.elements.length; i++){
					if(document.alertForm.elements[i].type == "checkbox"){
						if(document.alertForm.elements[i].checked == true){
							chkd = chkd + 1;
						}
						
					}
				}
				if(chkd == 0){
					alert("You have not selected any areas of interest");
					return false;
				}
				answer = confirm("Confirm the selections made are correct");
				if(answer){
					document.alertForm.submit();
				}
				else{
					return false;
				}
			}