RegEx issues..

[xprt]

hi guys,
im trying to parse some html without success...
what i got is a string that holds an html.

i need to remove DIVS from it, but only if the div contains an image
with a specific src.

for example: this entire div should be replaced with an empty string...
<div><img src="bad.gif"></div>

and this should stay as is.
<div><img src="good.gif"></div>


what i was trying to do is using the following pattern :
<div.*bad.gif.*</div>

im new with regex so be gentle...(:
thx!