It seems, that PF tabs are displayed using Javascript on load of the page. So during the rendering of the page the first picture we see is this one:
![Image](http://img193.imageshack.us/img193/9031/tabsrendering.png)
and only in some time (300-400 ms) we see the two real beautiful tabs:
![Image](http://img202.imageshack.us/img202/1209/tabsrendering3.png)
This is a common behavior for Firefox, Opera and Chrome. Ie 8 renders tabs ok and IE7 - not. I really cannot discover, how to prevent this rendering. The pause between "tabs as ul" and "tabs as tabs" depends on the size of the page - the larger is the page, the longer users see tabs as the non-numerated list.
Thanks!