function email_validate(email)
{
	     var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;  
	     var hasError=false;

         if(email == '') {  
             hasError = true;  

         }  
         else if(!emailReg.test(email)) {  
             hasError = true;  
         }  
         
         return hasError;
}