图像移动效果，小图片移动

答案：<HTML>
<HEAD>
<TITLE>图像移动效果</TITLE>
<STYLE>
.30PT{font-size:60pt;color:red;font-family:方正行楷繁体}
</STYLE>
<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>
</HEAD>
<BODY OnLoad="getwindowsize()" OnResize="getwindowsize()" background="/jscss/demoimg/bgdemo2.jpg">
<div id="pic1" style="position:absolute; visibility:visible; left:0px; top:0px; z-index:-1"> 
  <img src="/jscss/demoimg/wall_s8.jpg" border="0" width="80" height="60"></div>
<script language="javascript">
var pic1=eval('document.'+_all+'pic1'+_style);
</script>
<p><center>
<font class=30pt><br>
    <font color="#3366FF">想去踢球吗？</font></font><br>
<br><br><br><br>
  </center></p>
</BODY>
</HTML>
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