<div id="point1" STYLE="position:absolute;visibility:visible;">
<img src="ball.gif" width=30 height=29 border=0>
</div>

<div id="point2" STYLE="position:absolute;visibility:visible;">
<img src="ball.gif" width=30 height=29 border=0>
</div>
<SCRIPT LANGUAGE="JavaScript">
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
var xPosLeft = 20;
var xPosRight = 300;
var step = 3;
var delay = 30;
var yPos = 0;
var height = 0;
var offset = 0;
var yon = 0;
var name = navigator.appName;
if (name == "Microsoft Internet Explorer") {
yPos = document.body.clientHeight;
xPosRight = document.body.clientWidth - 150;
point1.style.top = yPos;
point2.style.top = yPos;
}
else {
yPos = window.innerHeight;
document.getElementById('point1').style.left = yPos;
document.getElementById('point1').style.visibility = "hidden";
document.getElementById('point2').style.left = window.innerWidth - 155;
}
function changePos() {
if (yon == 0) {
yPos = yPos - step;
}
else {
yPos = yPos + step;
}
if (name == "Microsoft Internet Explorer") {
height = document.body.clientHeight;
offset = point1.offsetHeight;
}
else {
height = window.innerHeight;
offset = 33;
}
if (yPos < 0) {
yon = 1;
yPos = 0;
}
if (yPos >= (height - offset)) {
yon = 0;
yPos = (height - offset);
}
if (name == "Microsoft Internet Explorer") {
point1.style.left = xPosLeft;
point1.style.top = yPos + document.body.scrollTop;
point2.style.left = xPosRight;
point2.style.top = yPos + document.body.scrollTop;
}
else {
document.getElementById('point1').style.left = xPosLeft;
document.getElementById('point1').style.top = yPos + window.pageYOffset;
document.getElementById('point2').style.left = xPosRight;
document.getElementById('point2').style.top = yPos + window.pageYOffset;
   }
}
function Start()
{
if (name != "Microsoft Internet Explorer") {
document.getElementById('point1').style.visibility = "visible";
}
loopfunc();
}
function loopfunc()
{
changePos();
setTimeout('loopfunc()',delay);
}
window.onload=Start;
//  End -->
</script>