The easiest (if it works, see Notes) way would be to put the script on the parent page, then in the calls on the page(s) in the iframe use this syntax:
Code:
<a href="#" onMouseOut="parent.MM_nbGroup('out');" onMouseOver="parent.MM_nbGroup('over','Gallery','galleryimages/band1.jpg','',1);">
Notes: This script is more complex than needed for the function it performs, parts may need to be left behind on the page in the iframe. See:
Image Thumbnail Viewer II
as an alternative script. This alternative would still need be modified to target the parent page image. Go with what you've got first.
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