Please help with: Random Images with customized links...

Here is my Question: I am using the latest built of gallery and assume that the random-block is accordingly. I patched the random block so it shows just from one album (excellent by the way, got it here in the forum). For each picture I have a custom field called URL, and would like to link to this Url rather than to the gallery script.

Is there a hack out ? :o Any help in this matter is greatly appreciated.