var errfound = false;
function ValidLength(item, len) {
   return (item.length >= len);
}
function ValidEmail(item) {
  var reg = '^[_a-zA-Z0-9\.\-]+@[_a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,4}$';
  return (item.match(reg)) ? true : false;
}
function error(elem, text) {
   if (errfound) return;
   window.alert(text);
   if(elem.type == 'text') elem.select();
   elem.focus();
   errfound = true;
}