I'm under the distinct impression that I need to restore your faith in me after yesterday's debacle and so today I will and share something more useful. Here's a way in JavaScript to add a validation method to all string objects. All you have to do is add the following function to your library:

String.prototype.isFormat = function ( sType ) {
var undef;
var aTypes = new Array();
aTypes['time'] = /^[0-2]?\d:[0-5]{1}\d/;
aTypes['date'] = /^[0-3]?\d\/[0-1]?\d\/\d{4}/;
aTypes['@unique'] = /^\D{4}-[\d|\D]{6}/;
if ( isUndefined( aTypes[ sType ] ) ) {
return sType.test( this );
} else {
return aTypes[ sType ].test( this );
}
}

Then when you're validating fields you can make it a little simpler. Here's a function that validates three fields. Note that in the last field we are using a custom written Regular Expression.

function validateForm( frm ) {
if( !frm.DateField.value.isFormat("date") )
alert('You need to enter a date in this field!');
if( !frm.TimeField.value.isFormat("time") )
alert('You need to enter a time in this field!');
if( !frm.PhoneNumber.value.isFormat(/^\d{9}$/ ) )
alert('You need to enter a number of 9 digits!');
}

Okay, so it doesn't make it that much simpler but it's a good way of demonstrating the use of JavaScript's Prototype object. Am I let off now?