// Check mail JavaScript function (universal)
// frmName - name of form (string)
// frmField - name of field (string)
// alertMess - warning message (string)

 function ChkMail(frmName, frmField, alertMess){	
	var regExpObj=/^[\w_-][\w\._-]{0,}@[A-Za-z\d][A-Za-z\d\.-]{1,}\.[A-Za-z]{2,4}$/;
	var email = document.forms[frmName].elements[frmField].value; 
	var res = regExpObj.exec(email);

	if(res==null){
		alert(alertMess);
		eval("document."+frmName+"."+frmField+".focus()");
	}

	return (res!=null);
 }