鼠标移上换图的超链接怎么做？

Question

鼠标移上换图的超链接怎么做？
 悬赏分：5 - 离问题结束还有 14 天 23 小时
<script language="javascript"> 
function floatbutton(picname){ 
document.sbt.src=picname 
} 
</script> 
<a href="#" 
onmouseover="floatbutton('图1')" 
onmouseout="floatbutton('图2')"> 
<img src="图2" name="sbt" border="0"></a> 
我还需要一个连接 需要图3 图4 像图1 图2 这样换 应该怎么做？

Answer 1

function changeIMG(obj,imgurl){
 obj.src=imgurl
}<img src="图2" name="sbt" border="0" onmouseover="changeIMG(this,'图1')" onmouseout="changeIMG(this,'图2')"> 
<img src="图3" name="sbt" border="0" onmouseover="changeIMG(this,'图4')" onmouseout="changeIMG(this,'图3')"> 

Answer 2

<img src="图3" name="sbt" border="0" onmouseover="this.url('图三')" onmouseout="this.url('图四')">

Answer 3

function changeIMG(obj,imgurl){
 obj.src=imgurl
}<img src="图2" name="sbt" border="0" onmouseover="changeIMG(this,'图1')" onmouseout="changeIMG(this,'图2')"> 
<img src="图3" name="sbt" border="0" onmouseover="changeIMG(this,'图4')" onmouseout="changeIMG(this,'图3')"> 

Answer 4

<a href="#">  
<img src="图2" name="sbt"
 onmouseover="this.src='图1'"
 onmouseout="this.src='图2'"
 border="0"></a>