[jQuery] adding jQuery causes my page to flash/blink on load

Hi

when I added jquery-1.3.2 and jquery.ui-1.7.1 to my page here

http://ssmedgroup.com/beta/index.html

it causes my page to flash/blink as the browser redraws the page on
load. (click on the navigation tab; you'll see what I mean.) It
happens on safari 4, chrome (though less so), and IE6&8. does not
happen on firefox.

I notice that merely include the js files will do it; i.e., I don't
have to actually create any UI objects or write any onload code of my
own.

If I take out links to the jquery* js files, then the flash/blink goes
away.

Now I don't see this on jquery site itself, so it appears to be
something specific with my page. but what?

thanks for any hint.