image swap iframe etc

[theJackal]

Here is my problem. I am using an iframe in an html page that dynamicly fills its self with thumbnails. I want to be able to do mouseover a thumbnail and change the full size image which is based in the what is effectively the parent window? Can any body please help? confused: I hope so. Thanks in advance.:

[zachzach]

onmouseover='window.top.document.image1.src="thenewimage.GIF"'

umm try eather window.top or top or window.parent and stuff like that