jquery animate and image resize flickering

i've a problem with a resize effect that i've done in http://www.mcz-scenario.it. When you click on a language, you can see the "background" image transferring into a certain position of the screen.

this is the image:

<img id="lago" src="http://www.mcz-scenario.it/images/lago.jpg" height="1070" width="1600" alt="lago" />

And this is the "resize" effect

$("#lago").animate({
height: 148,
width: 264,
top: endPosition2.top+42,
left: endPosition2.left+350+26开发者_运维问答}, 4000);

Now... I see some flickering running this animation in Firefox. How can i handle this? Is it normal because the image is too large? Help me please :(

THX

---

Try making the animation faster, say 500 instead of 4000. It seems less disturbing this way even if there is a bit of flicker.

A solution would be to use Flash.