Here is the test page.
It works fine in Firefox and Google Chrome but not in Opera and Internet Explorer.
If you don't have Firefox or Google Chrome, I can tell you how it should be:
when you click an element, if should be lighter green, rolling out of a clicked element, it should be darker green. The same happens with elements that are not selected, ubt they are gray. But in IE and Opera, when you roll out of a selected element, it is gray.
I can't debug it in Opera because I have no debugger there, like Firebug.
I don't need to post any code because you can look at the cource code.
Please help me, thanks!