JavaScript制作会反弹的浮动图片

现在网上流行会弹来弹去的浮动图片。想给自己的网页也加上一个吗？其实很简单，把下面这段代码加到网页的之间，然后，把图片换成你中意的就OK啦！

　　到这里下载示例代码

< div id="img" style="position:absolute;">
< a href="http://www.eschool.com.cn" target="_blank">
< img src="eschool-button.gif" >
< /a>
< /div>

< SCRIPT LANGUAGE="JavaScript">
< !-- Begin
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;
}
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;
}
if (xPos >= (width - Woffset)) {
xon = 0;
xPos = (width - Woffset);
}
}
function start() {
img.visibility = "visible";
interval = setInterval(′changePos()′, delay);
}
start();
// End -- >
< /script >