/*首页浮动广告*/  

<!-- Begin                        
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 start() {                        
img.visibility = "visible";                        
interval = setInterval('changePos()', delay);                        
}                        
start();                        
// End -->