Just took a quick look and make a call to <scripttype="text/javascript" src="js/date.js?1"></script>
I couldn't find a js/date.js?1 but I did find a http://map.toronto.ca/maps/js/date.js file. Could that path be wrong? Seems all your other calls reference the /maps directory.
Edit: Looked at the paths for js/GC* files and all of them allow me to access the files when I nest them in the /maps directory.