function validate(form_id,email) {
	   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	   var address = document.forms[form_id].elements[email].value;
	   if(reg.test(address) == false) {
		  alert('Invalid Email Address');
		  return false;
	   }
	}