function checkdata()

{	 
 if (document.login.service.value == 'Service') {

         alert ("Please determine your service type.");

         document.login.service.focus();
		   
         return false;

     } 

	   if (document.login.email.value.length == 0) {

         alert ("The 'E-mail' field requires an entry.");

         document.login.email.focus();
		   
         return false;

     } 
	 
	var x = document.login.email.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(x)){
		alert ("The ['E-mail'] address is NOT valid.");
		document.login.email.focus();
		 return false;
		}
		 
	
	
	return true;
	}