The Google Toolbar includes a pop-up blocker that stops unwanted Internet pop-ups from cluttering your screen, but can also block pop-ups that you do want. You can tell the Google Toolbar to allow pop-ups for specific web sites on a site-by-site basis. When pop-up blocking is active, the toolbar appears similar to:

To turn off pop-up blocking for this site (in the above example, www.wabash.edu), click where the arrow is pointing. The toolbar then changes similar to:

You can later turn pop-up blocking for this site back on by clicking on "Site popups allowed".

If you want to turn off the Google Toolbar popup blocker for all sites, click on "Google" (at the left of the toolbar), select "Options" from the drop-down menu, and clear the check next to "Popup Blocker" in the "Accessories" Section.