FLASH动画页面全屏飘动代码

<div id="img" style="position:absolute;z-index=99;">
  <embed src="http[color=#0080C0]://www.taoper.com/blog/attachments/month_0809/v200892822326.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash"></embed></div>
<p>
  <SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var xPos = document.body.clientWidth-20;
var yPos = document.body.clientHeight/2;
var step = 1;
var delay = 5;
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);
}
function pause_resume() {
    if(pause) {
        clearInterval(interval);
        pause = false;
    }else {
        interval = setInterval('changePos()',delay);
    pause = true;
    }
}
start();
//  End -->
</script>[/color]