jQuery UI 1.8 dialog problem

jQuery UI 1.8 dialog problem

I'm using the dialog to post an overlay advertisement on my site.  I am not having any trouble in IE7 at all oddly enough however I am having trouble in both FireFox 3 and Safari.  I've taken the components out of the web application and created a test page and nothing I've read and tried seems to work.  Any help would be appreciated.  I've attached the HTML test page that I'm using.