Not smooth animation Jquery.Animate?

There is a page for her many pictures, she's a big — 4000х2000. And in some browsers the animation is done via jquery.easing.1.3 (and without it too, no difference)

$("html:not(:animated)"+( ! $.browser.opera ? "body:not(:animated)" : ")).animate({scrollTop: temptop+'px',scrollLeft: templeft+'px'}, {duration: 3000, easing: "easeInOutExpo"});

brakes.

Example: vintage.skulditsky.kz/index.html

Specialists in JQuery, please help me!