Dreambook: Shockwave Issue

On one of my sites I use a shockwave based menu. When embedding the menu in a dreambook page the menu doesn’t function properly. The problem is specific to Firefox, AOL and Safari browsers. Works fine in MS IE. The problem is this: within the dreambook page only, any link in the menu where target="_parent" or “_top” does not work. Any link where target="_blank" or “_new” works fine. Is this a problem with dreambook? I’ve used this menu for 3 years and have had no cross-browser funtionality issues. Just this problem within dreambook. Anybody have a clue on a workaround?