javascript error in IE cannot see or workout problem

In IE8 on vista I am getting the following JS error,

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1;

Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E)

Timestamp: Thu, 1 Sep 2011 12:18:24 UTC

Message: Object doesn't support this property or method Line: 28

Char: 2 Code: 0 URI:

http://www.safetymaintenancecompany.co.uk/media/js/site.js

Below is my code of said file,

$(document).ready(function(){

Cufon.replace('dd h1', { 'fontSize': '50px', 'letterSpacing': '-4px开发者_如何学C'} ); // Works without a selector engine

$('#slides').slides({
    preload: true,
    preloadImage: '../images/loading.gif',
    play: 5000,
    pause: 2500,
    slideSpeed: 600,
    hoverPause: true,
    generatePagination:false
});

//$('footer').height( ($(window).height() - $('#main').height() + "px" ));


$('.title').click(function(event){
    event.preventDefault();
});

$('.basic li > h2').hover(function(event) {
    $(this).addClass('hover');
}, function() {
    $(this).removeClass('hover');
});

$("#contactForm").validate({
    rules: {
        name: "required",
        email_address: {
            required: true,
            email: true
        },
        phone_number: {
            required: true
        }
    }
});

});

I honestly cannot see an problems with this code, is there some wrong with it?

If I can count correctly, that's the $("#contactForm").validate line, so maybe $("#contactForm") returns null? You might try alert-in the result first, just to be sure if $("#contactForm") is the problem, or a missing validation plugin.

It turned out that IE8 did not appreciate me hot linking to the validation library, however this was only in Vista. I realise that sounds almost impossible but those are the facts.