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<html>
<head>
<style type="text/css">
</style>
<script type="text/javascript">
function $(id)
{
return document.getElementById(id);
};
function changeOpacity()
{
var direction=-1;
var opacityValue=100;
function doChange()
{
if(++opacityValue>=100)
{
direction=-1;
}
if(--opacityValue<=0)
{
direction=1;
}
opacityValue+=direction;
$("img1").style.filter="alpha(opacity="+opacityValue+")";
$("img1").style.opacity=opacityValue/100;
};
setInterval(doChange,10);
};
</script>
</head>
<body onload="changeOpacity()">
<img id="img1" src="http://www.csdn.net/Images/logo_csdn.gif" />
</body>
</html>