Referring the Js file it seems its not the problem with the window.event function but the included function in it.
just try disabling that function in the js.script.js file.
like
window.addEvent('load', function() {
alert('window.addEvent Loaded');
//equalHeight();
});
Since the code seems to complex, any way, do you remember when it stop functioning, after adding any particular code or something. Just check the equalHeight or the functions that are called within it.
Hope this helps