Prueba con algo así:
Código Javascript
:
Ver original$(document).ready(function(){
$('.div-izq').mouseover(function(){
$('.div-izq').stop().animate({backgroundPosition: "0 0"}, 1000);
}).mouseout(function(){
$('.div-izq').stop();
});
});
$('.div-derch').mouseover(function(){
$('.div-derch').stop().animate({backgroundPosition: "-1000 0"}, 1000);
}).mouseout(function(){
$('.div-derch').stop();
});
});