Javascirpt help needed

Hi, i need a help

suppose i have a page with a textarea and a link. When i click on the link, a new popup window will appear with about 50-60 images. After clicking each image, the image url will be pasted to it's textarea (first page). How to do that?

Also, i want to use a iframe to the popup. Because, there are many images there and the popup area can't hold this all.

Thanks in advance