I created a vertical spry menu that contains a few submenus as well. The menu works fine in all other browsers except Internet Explorer. What do I need to do in order for it to work in IE?
If using CS3, update your Spry to version 1.6.1.
As you can see from my comment, I was also having issues making my menu work in IE, until I realized that I had the wrong version of Spry - I was using 1.4. Go here: http://labs.adobe.com/technologies/spry/home.html to download the latest version of Spry (1.6.1). After you're finished, double-click on the .mxp file, and Dreamweaver will automatically sync with it. To update any Spry files in your site, go to Site > Spry Updater. That should automatically update any Spry files you have on your site, as well as back up your old files. My menu works great now - in all browsers! I hope this helps!
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