Ah, the short sweet answer of a "lifer" in the ng. ;-)
glm,
We really appreciated it when a poster has put at least a bit of effort in trying to find the answer themselves. Have you tried searching this ng using... http://www.google.com/advanced_group_search?hl=en ....and the keywords from your post? Or do you have some code that you have written that we can help you with?