function validateValue(elm, dataType)
{
   elm.className = "invalid";
   switch (dataType)
   {
      case 'int':
         if ((elm.value == "") || (isNaN(elm.value))) { elm.className = "invalid"; }
         else { elm.className = "valid"; }
      break;
      case 'email':
         var re = /^\w[-\.\w]+@\w+(\.\w+)+$/;
         if (!re.test(elm.value)) { elm.className = "invalid"; }
         else { elm.className = "valid"; }
      break;
   }
}
function validate(formular)
{
   if (formular.email.value=="")
   {
      alert("Your e-mail address is empty.\nPlease fill this field.");
      formular.email.focus();
      return false;
   }
   else if (window.RegExp)
   {
      var re = /^\w[-\.\w]+@\w+(\.\w+)+$/;
      if (!re.test(formular.email.value))
      {
         alert ("Inserted email address is not valid.");
         formular.email.focus();
         return false;
      }
   }
   return true;
}