statistics是什么意思:求广告图片代码

<SCRIPT LANGUAGE="JavaScript">
var isNS = ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 4));
var _all = \'\';
var _style = \'\';
var wwidth, wheight;
var ydir = \'++\';
var xdir = \'++\';
var id1, id2, id3;
var x = 1;
var y = 1;
var x1, y1;
if(!isNS) {
_all=\'all.\';
_style=\'.style\';
}
function getwindowsize() {
clearTimeout(id1);
clearTimeout(id2);
clearTimeout(id3);
if (isNS) {
wwidth = window.innerWidth - 55;
wheight = window.innerHeight - 50;
} else {
wwidth = document.body.clientWidth - 55;
wheight = document.body.clientHeight - 50;
}
id3 = setTimeout(\'randomdir()\', 20000);
animate();
}
function randomdir() {
if (Math.floor(Math.random()*2)) {
(Math.floor(Math.random()*2)) ? xdir=\'--\': xdir=\'++\';
} else {
(Math.floor(Math.random()*2)) ? ydir=\'--\': ydir=\'++\';
}
id2 = setTimeout(\'randomdir()\', 20000);
}
function animate() {
eval(\'x\'+xdir);
eval(\'y\'+ydir);
if (isNS) {
pic1.moveTo((x+pageXOffset),(y+pageYOffset))
} else {
pic1.pixelLeft = x+document.body.scrollLeft;
pic1.pixelTop = y+document.body.scrollTop;
}
if (isNS) {
if (pic1.top <= 5+pageYOffset) ydir = \'++\';
if (pic1.top >= wheight+pageYOffset) ydir = \'--\';
if (pic1.left >= wwidth+pageXOffset) xdir = \'--\';
if (pic1.left <= 5+pageXOffset) xdir = \'++\';
} else {
if (pic1.pixelTop <= 5+document.body.scrollTop) ydir = \'++\';
if (pic1.pixelTop >= wheight+document.body.scrollTop) ydir = \'--\';
if (pic1.pixelLeft >= wwidth+document.body.scrollLeft) xdir = \'--\';
if (pic1.pixelLeft <= 5+document.body.scrollLeft) xdir = \'++\';
}
id1 = setTimeout(\'animate()\', 30);
}
</script>
<div id="pic1" style="position:absolute; visibility:visible; left:0px; top:0px; z-index:auto">
<img border="0" src="images/logo.gif" width="60" height="60">
</div>
<script language="javascript">
var pic1=eval(\'document.\'+_all+\'pic1\'+_style);
if (document.layers || document.all) window.onload = getwindowsize;
</script>

这是个浮动的图片,找个源码,楼上的好像是在一个位置不动啊,

见一楼的代码了．