[jQuery] Sliding an image into a box - Little animation

[jQuery] Sliding an image into a box - Little animation

Hi Folks
I am trying make a little effect.
In my menu/box/container I want a Sliding effect of  a image or background color.
So when mouseover
------> the image complete the box from left to right. One time and stop.
$("dd/ul/li").mouseover( function() {
$($(this).addClass("selected")).animate({top: -205},"slow");
return false;
    } );<br clear="all">
Ideas?
Regards
--
Mário