//Instant Validation with JavaScript-enabled WebDB
  //Listing 2

  //The JavaScript function isDateTime checks whether the text entered 
  //in a field has the date/time format MM/DD/YYYY HH:MI:SS, displaying an error 
  //message and returning a value of “false” if it does not.

function isDateTime(theElement, theName)
{
// This function checks if the text entered in a field has the
// format MM/DD/YYYY HH:MI:SS.
// Only the format is checked, not the date and time itself.

 var date_regex = /^\d{1,2}\/\d{1,2}\/\d{4} \d{2}:\d{2}:\d{2}$/;

 if (!date_regex.test(theElement.value))
 {
  alert(theName + ": " + theElement.value +
      " is NOT a valid date/time format");
  theElement.focus();
  return(false);
 }

 return(true);
}