[OpenLayers-Dev] any map action causes custom control.panel to reload tool-images in ie6

[vangenuchten at nieuwland.nl]

If you look at openlayers > examples > custom control.panel in  
internet explorer 6. Every map action (zoom, pan, select control)  
causes all the tool-images to reload. Anybody an idea how to prevent  
this (besides creating a-non-openlayers-panel). I noticed the editing  
toolbar (to which you can add custom controls also) does not have this  
behaviour.