顶呀，怎样实现jQuery从右向左展开DIV（动画效果）？？？

[code=JScript][
<!DOCTYPE html>
<html>
<head>
  <style>
div {
  position:absolute;
  background-color:#abc;
  left:50px;
  width:90px;
  height:90px;
  margin:5px;
}
</style>
  <script src="jquery162.js"></script>
</head>
<body>
  <button id="left">&laquo;</button>
<div class="block"></div><script>$("#left").click(function(){
  $(".block").animate({"left": "-=50px"}, "slow");
});</script></body>
</html>
/code]