function validateContact() {
	if (document.getElementById('Name').value.length == 0) {
		alert ('You must supply your first name.');
		return false;
	}
	
	if (document.getElementById('Surname').value.length== 0) {
		alert ('You must supply your surname.');
		return false;
	}
	
	if (document.getElementById('Email_addr').value.length== 0) {
		alert ('You must supply your email address.');
		return false;
	}
	
	var validateEmail = echeck(document.getElementById('Email_addr').value) ;
	
	if (document.getElementById('Email_addr').value.length > 0 && !validateEmail) {
		alert ('The email address you provided is not valid.');
		return false;	
	}
	
	if (document.getElementById('textarea').value.length== 0) {
		alert ('You must supply us with details of your enquiry.');
		return false;
	}			
	return true;
}

/* Email address validation */

	function echeck(str) {
	
			var at="@"
			var dot="."
			var lat=str.indexOf(at)
			var lstr=str.length
			var ldot=str.indexOf(dot)
			if (str.indexOf(at)==-1){
			   return false
				}			 			
	
			if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
			   return false
			}
	
			if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
				return false
			}
	
			 if (str.indexOf(at,(lat+1))!=-1){
				return false
			 }
	
			 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
				return false
			 }
	
			 if (str.indexOf(dot,(lat+2))==-1){
				return false
			 }
			
			 if (str.indexOf(" ")!=-1){
				return false
			 }
	
			 return true					
		}