var errfound = false;
function ValidLength(item, len) {
   return (item.length >= len);
}
function trim(s) {
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))  {
    s = s.substring(1,s.length);
  }
  while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))  {
    s = s.substring(0,s.length-1);
  }
  return s;
}
function ValidEmail(item) {
  item = trim(item);
  var reg = '^[_a-zA-Z0-9\.\-]+@[_a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,4}$';
  return (item.match(reg)) ? true : false;
}
function ValidStreet(item) {
  var reg = '^.*[0-9]+.*$';
  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;
}