Toolbar images not showing up in Mozilla 1.4

I realize that many are going to tell me to upgrade to a newer version of Mozilla, but that really isn't possible, as this webapp needs to be compatible with Red Hat Enterprise Linux 3, which has Mozilla 1.4.4. Whenever FCKeditor loads I do not see any of the tool bar images, and none of the drop down menus are populated. When i move my mouse over the icons the images show up, but disappear once again when my mouse moves off of them, as if it cannot find the main images, though its not showing a broken image. It works fine in Firefox 1. I'm using the newest version of FCKeditor, i'm not getting anything in the javascript console or the debug window with FCKeditor in debug mode. Does anybody have any suggestions? Thank you.