Exclude topics from the index

I was wondering if it is possible to exclude topics from an index based on a conditional build tag or if the title contains "x" or by any other method (script?).

There are hundreds of pages in this help that only contain an image and I don't want them in the Index.  For example, there is a topic called "Widows dialog" and "Menu dialog", etc.   I want to excude them from the Wizard without having to manually delete 500 pages from the index.  Basically any topic with the word dialog in it.  Of course I can have it not index the word dialog, but that doesn't help much.

Also, what is your opinion on having topics with only screen shots in the index? Anyone else ever do this?

Thanks for any feedback!