肉番动漫迅雷下载:请写一个流动图片的代码放在网页中，一定要可以用的

图片在页面内随意飘动，遇到边界还会反弹。

<div id="img" style="position:absolute;">
<a href="http://www.helpor.net" target="_blank">
<img src="http://code.helpor.net/picture/swimming.gif" border="0"></a>
</div>

<SCRIPT LANGUAGE="JavaScript">
<!--
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 www_helpor_net() {
img.visibility = "visible";
interval = setInterval('changePos()', delay);
}
www_helpor_net();
//For more,visit:www.helpor.net
-->
</script>

自由移动的图片

<div id="helpor_net" style="position:absolute; visibility:visible; left:0px; top:0px; z-index:-1">
<img src="http://code.helpor.net/picture/swimming.gif" border="0">
</div>
<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 www_helpor_net() {
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) {
helpor_net.moveTo((x+pageXOffset),(y+pageYOffset))
} else {
helpor_net.pixelLeft = x+document.body.scrollLeft;
helpor_net.pixelTop = y+document.body.scrollTop;
}
if (isNS) {
if (helpor_net.top <= 5+pageYOffset) ydir = '++';
if (helpor_net.top >= wheight+pageYOffset) ydir = '--';
if (helpor_net.left >= wwidth+pageXOffset) xdir = '--';
if (helpor_net.left <= 5+pageXOffset) xdir = '++';
} else {
if (helpor_net.pixelTop <= 5+document.body.scrollTop) ydir = '++';
if (helpor_net.pixelTop >= wheight+document.body.scrollTop) ydir = '--';
if (helpor_net.pixelLeft >= wwidth+document.body.scrollLeft) xdir = '--';
if (helpor_net.pixelLeft <= 5+document.body.scrollLeft) xdir = '++';
}
id1 = setTimeout('animate()', 30);
}
var helpor_net=eval('document.'+_all+'helpor_net'+_style);
// -->
</script>