JavaScript製作會反彈的浮動圖片

javascript|浮動 　　現在網上流行會彈來彈去的浮動圖片。想給自己的網頁也加上一個嗎？其實很簡單，把下面這段代碼加到網頁的之間，然後，把圖片換成你中意的就OK啦！

　　到這裡下載範例程式碼

< div id="img" style="position:absolute;">
< a href="http://www.eschool.com.cn" target="_blank">
< img src="http://www.webjx.com/htmldata/2005-02-24/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 >