求一段javascript程序，实现图片的交替显示

<img border="0" src="movie1.png" width="350" height="250">
<div>
  <img border="0" src="movie1.png" width="50" height="40">
  <img border="0" src="movie2.png" width="50" height="40">
  <img border="0" src="movie3.png" width="50" height="40">
</div>
要求：点击下面的小图片时，把其放大显示在大图片处（红色）
　　　且图片的最大尺寸不能超过350*250

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楼上正解楼上正解楼上正解楼上正解楼上正解楼上正解

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引用

<img id="largeImg" border="0" src="movie1.png" width="350" height="250">
<div>
  <img onclick="a(this)" border="0" src="movie1.png" width="50" height="40">
  <img onclick="a(this)" border="0" src="movie2.png" width="50" height="40">
  <img onclick="a(this)" border="0" src="movie3.png" width="50" height="40">
</div>
<script>
function a(obj)
{
var src = obj.src;
var largeImg = document.getElementById("largeImg");
largeImg.src = src;
}
</script>

正确！！

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