List boxes

I've created a list box (multi-select) in Access 2000 which displays reports that have been created. If I select a single report, it print previews fine, when I try to print preview multiple reports, nothings, can't create reports based on criteria selected. If I go to my query table and type in the multiple reports (using ";" and qoutes) as a criteria no problem. I want to do this directly from the list box. Any ideas???