Hi Aaronheine!

It's actually not an error, it's a warning message. It's because jQuery 1.6 references the event.layerX and event.layerY. Upgrade to jQuery 1.7 and the warning message will disappear.

I'm not sure what thumbnails you mean. But I do see an error on the page:

a is undefined
function Lg(a){a=a.f[1];return a!=j?a:...);function gh(a){a[Dc]&&a[Dc][gc](a)}
main.js (line 30)

This error may be causing whatever other functions to stop working.

The problem with the thumbnails is in this file. Here is the code:

jQuery(document).ready(function(){
	jQuery('.imagecol').each(function(){
		var t = jQuery(this).find('.wpcart_gallery .thickbox');
		t.colorbox({
			maxWidth :'90%',
			maxHeight :'90%',
			returnFocus : false
		});
		
		jQuery(this).children('.thickbox').click(function(e){
			var that = jQuery(this);
			e.preventDefault();
			t.each(function(){
				if (jQuery(this).attr('href') == that.attr('href')) {
					jQuery(this).click();
					return;
				}
			});
		});
	});
});

It is only targeting the "thickbox" class inside of the "imagecol" div. Which DOES NOT contain the ".wpcart_gallery .thickbox" link/image.

Honestly, I'm not sure what the second function is trying to do, but just using code like this should work:

jQuery(document).ready(function(){
  jQuery('.thickbox').colorbox({
    maxWidth :'90%',
    maxHeight :'90%',
    returnFocus : false
  });
});

Oh, the thumb links have a misspelling... I see "rev" instead of "rel" for the URL.

And oddly the main image doesn't open when you click on it, so maybe try using a window load instead of a document ready:

jQuery(window).load(function(){
  jQuery('.thickbox').colorbox({
    maxWidth :'90%',
    maxHeight :'90%',
    returnFocus : false
  });
});

Yes, I know, but I think colorbox uses the rel tag.