以下是代码片段：
一:把下面的代码加入<head>区域中
<SCRIPT LANGUAGE=JavaScript>
<!-- Begin
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);
}
// End -->
</script>
二:在<body>区中加入如下代码并改变其中的图像地址:
<div id=pic1 style=position:absolute;visibility:visible;left:0px;top:0px;z-index:-1><img src=191.gif border=0></div>
<script language=javascript>
var pic1=eval('document.'+_all+'pic1'+_style);
</script>
三:修改<body>将下面的代码加入
OnLoad=getwindowsize() OnResize=getwindowsize() |
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