I have a web page where various fields are filled in. To populate one of these fields I need to go back to the server to get a list of vendors. The page where I am entering the data from will not be submited to the server when the user is tyring to go get the list of vendors so I can't navigate away from the page and loose all their data entry. My thought is to have a pop-up window which would go get the list of vendors and have the pop-up return what vendor was selected.
If I go the pop-up route I would like the window under the pop-up to be covered in gray. I have seen something like this before but can't remember where I saw it or how to do it.
Any other suggestions?