Problems with Cufon fonts and mega menu

Thanks to this bit of code

#primary_menu { position: relative !important; z-index: 9999 !important; }

provided by Problems with Cufon fonts and menues in IE8 I got this mega menu working with my cufon heading.

One way to see if you're compliant

In Firefox, right-click on a page and click "View Page Info". The default "General" tab shows Render Mode which should read "Standards compliance mode", not "Quirks mode".