It is a bug in Msie implementation. It refuses to get images out of cache if the source is built up using innerHTML.
From: Erik Arvidsson
Sent: July 18, 2003
Subject: Re:XLoadTree: Caching of image icons
This is either a bug in your browser, incorrect browser settings or incorrect server settings. Images are cached when all these things work as supposed.
can I cache the images in front of an entry, so that it will be loaded only once?
I have a menu with about 50 entries and 300 icons. it seems that the same icon is loaded from the server everytime, instead of taking the cached one.
Thanks in advance,