<a href="#" class="hoverer">
	<span class="holder">
		<img>
		<img>
	</span>
</a>

$(".hoverer").live("mouseover mouseout", function(event) {
  if ( event.type == "mouseover" ) {
    event.target.find(.holder).animate({
				left:-300px
			});
  } else {
    event.target.find(.holder).animate({
				left:0px
			});
  }
});