[RESOLVED] [2005] Menu problem

ok here's something interesting and maybe someone else has the same problem and can explain this to me. oh and this problem ONLY occurs in IE7

I have a menu doesn't matter if it's dynamically created with a sitemap or if it's static or vertical or horizontal. when ever a postback is performed the menu shifts down and then a javascript error is detected the error code is '0.cells' is null or not an object. then if there are nested menu's and i rollover the parent menu item and the child is display it never goes away. on and it doesn't matter if the menu is formatted in any way or not. the only other information that i can provide is that the menu is nested in a table.