function checkdata()

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

         alert ("The 'Username' field requires an entry.");

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

     }
	  if (document.login.password.value.length == 0) {

         alert ("The 'Password' field requires an entry.");

         document.login.password.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 ['Username'] is NOT correct.");
		document.login.email.focus();
		 return false;
		}
		 
	
	
	return true;
	}