
<!-- 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 -->