I am using hotspots to launch drop down menus in frames.  They work fine except for users randomly complaining of a JavaScript error.  Clearing their cache usually fixes the problem but I'm trying to figure out what is causing it.  
The Java Script Error is "Description: 'ABRIOn' is undefined
Source: http://intranet/contents.htm Line 3259."

The line number in the error varies. This is on an Intranet and all users are using IE 5.5 or newer.  I compiled the project using DMB 3.3.  Thanks for any help in advance.

Jeff

When using frames this error can mean that the menu.js and menu_frames.js files are out of-synch.

Try recompiling your project and upload all the .js files back to your server and make sure that the newer files are overwriting the old ones.