Calling a Javascript function from a menu item
In a support incident we found that the include script:
<script type="text/javascript" src="CSSMenuWriter/cssmw/menu.js"></script>
is only used in older browsers and was causing a conflict with other JavaScripts. Deleting that line fixed the problem - Jason noted that IE6 browsers may have problems with the menus when that script is not included.
I also found that IE 8 was showing errors in the include file menu.php. The last few lines on that page are javascript that call methods or functions in the include mentioned above. I deleted those lines from my menu.php files and everything works fine in current browsers.