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mivox - 6:07 pm on Sep 9, 2002 (gmt 0)
Are you preloading the rollover images in the <head> of the page code? Disappearing buttons are often caused (in my experience) when the rollover images are not pre-loaded, so when the user rolls over the button, it seems to disappear while the mouseover image loads. If all the images are pre-loaded though, the change should be instantaneous.