1）<html>
<head>
<script language="JavaScript">
function setHeight()
{
var x=document.images
x[0].height="250"
}
</script>
</head>
<body>
<img src="../images/compman.gif" width="107" height="98" />
<form>
<input type="button" onclick="setHeight()" value="Change height">
</form>
</body>
</html>
2）<html>
<head>
<script language="JavaScript">
function setSrc()
{
var x=document.images
x[0].src="../images/hackanm.gif"
}
</script>
</head>
<body>
<img src="../images/compman.gif" width="107" height="98" />
<form>
<input type="button" onclick="setSrc()" value="Change image">
</form>
</body>
</html>
3）<html>
<head>
<script language="JavaScript">
function setWidth()
{
var x=document.images
x[0].width="300"
}
</script>
</head>
<body>
<img src="../images/compman.gif" width="107" height="98" />
<form>
<input type="button" onclick="setWidth()" value="Change width">
</form>
</body>
</html>
注意，图形文件换成自己的文件，试试，不错吧
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