JQuery snippet no longer works on new server.

Hi All,

My knowledge of Jquery and javascript is not all that great but just moved my site to a new server and for some reason this code no longer hides the element on pageload:

Event.observe(window, 'load', function() {
		$$('.hide_on_start').each(function(node) {
			node.hide();
		});

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Not sure what would cause this to happen but any element given the "hide_on_start" class should be hidden when the page is first loaded.

Any ideas why this has happened?