弹出广告怎么做！！！

在你觉得需要弹出广告的时候执行函数open()还是先看看基本的jscript的书吧

<body onload="JavaScript:window.open('http://www.sina.com.cn');">
<body onload="window.open('http://www.sina.com','')">
<script>
function ad_openWin() {
window.open ("popup2.htm", "", "height=370, width=400, top=0, left=0, toolbar=no, menubar=no, scrollbars=no, resizable=no, location=no, status=no")
}ad_openWin()
</script>