JavaScript实现带关闭按钮的网页漂浮广告代码

 
HTML结构实现<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>带关闭按钮的网页漂浮广告代码</title>
</head>
<body>
<div id="img" style="position: absolute; left: 311; top: 815;visibility :hidden;" onmouseover="clearInterval(interval)" onmouseout="interval = setInterval('changePos()', delay)" align="right">
<a href="#" target="_blank"><img border="0" src="图片路径" onload="return imgzoom(this,600);" onclick="javascript:window.open(this.src);" style="cursor:pointer;"/></a>
<span style="CURSOR:hand;color:red;font-weight:bold" onclick="clearInterval(interval);img.style.visibility = 'hidden'">X</span>
</div>
<script language=javascript src=ff.js>
</script>
</body>
</html>

对应的JavaScript逻辑代码（ff.js）如下：

 
JavaScript逻辑实现var xPos = 20;
var yPos = document.body.clientHeight;
var step = 1;
var delay = 30;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img.style.top = yPos;
function changePos() {
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = img.offsetHeight;
Woffset = img.offsetWidth;
img.style.left = xPos + document.body.scrollLeft;
img.style.top = yPos + document.body.scrollTop;
if (yon) {
yPos = yPos + step;
} 
} else {
yPos = yPos - step;
} 
if (yPos < 0) {
yon = 1;
yPos = 0;
} 
} else if (yPos >= (height - Hoffset)) {
yon = 0;
yPos = (height - Hoffset);
} 
} if (xon) {
xPos = xPos + step;
} 
} else {
xPos = xPos - step;
} 
if (xPos < 0) {
xon = 1;
xPos = 0;
} 
} else if (xPos >= (width - Woffset)) {
xon = 0;
xPos = (width - Woffset);
} 
} 
} } }
function start() {
img.style.visibility = "visible";
} 
interval = setInterval('changePos()', delay);