I'd like to create a pop-up window for my site. I've used behaviors in the past. I'm not sure if that's the best way now. Basiclly I have a photo gallery with thumbnails. Once you click the thumbnail I want a larger window to open with the image. I've seen the javascript windows used that use CSS lightbox, however I can't get it to work with my site. I guess I should mention I'm using asp vbscript ,ms sql database with a link to the image paths that are sitting in the images folder. Help me find the best solution to carry out this task. Thanks in advance.

What the server technology is will make no difference to using something like "Lightbox" or one of the variants.

You probably have a coding error.