Modal Popup and MasterPage

I have several modalpopups on a page that is inside of a MasterPage. The popups work fine, but in IE, the modalpopup opens inside the content area rather than over the entire page. I've searched these forums and have not come up with a solution. Does anyone have any ideas?

http://forums.asp.net/ShowPost.aspx?PostID=1357977 - and maybe vote on the work item to address this.