JavaScript实现网页背景闪电闪烁效果

<html>
<head>
<title>闪电闪烁背景</title>
</head>
<body>
<script LANGUAGE="JavaScript">
function blinkOn(){
theWin.document.bgColor = "000000"
nTimes++
JSCTimeOutID = window.setTimeout("blinkOff()",50);
}
function blinkOff(){
theWin.document.bgColor = "FFFFFF"
if (nTimes < 3)
JSCTimeOutID = window.setTimeout("blinkOn()",50);
else theWin.history.go(0)
}
function blinkit(aWin)
{
nTimes = 0
theWin = aWin
JSCTimeOutID = window.setTimeout("blinkOn()",50);
}
</script>
<form>
<div align="center">
<center>
<p>
<input TYPE="BUTTON" VALUE="欢迎光临本站" onClick="blinkit(self)"> 
</p>
</center>
</div>
</form>
</body>
</html>