Hidden iFrame Does not Jump to Anchor in FF

Hidden iFrame Does not Jump to Anchor in FF

I have a hidden iFrame (display:none) which I change the src attribute of to load new contents. When the iFrame has finished loading I make it visible again (display:inline).  This works fine except for anchors. The iFrame will not jump to an anchor when finished loading if its hidden in FF.

Any fixes or ideas?

Thanks