Reducing network traffic for rollover images

[Robert Hunt]

Is there a way (as in, response header or other HTTPServletResponse setting) 
that can persuade a
browser to use a cached version of an GIF/JPG that's used for a rollover 
effect?
I'd like to reduce the network traffic (and perhaps improve the browser's 
"response")
from browsers that attempt to (re)load a rollover image for every tiny 
mousemove increment --
only to receive a 304 response anyway.

-- RH 

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