<!--
var xPos = 20;
var yPos = 10;
var step = 1;
var delay = 30; 
var width,height,Hoffset,Woffset;
var y = 1;
var x = 1;
var interval=null;
var fad=null;

function changePos() 
{
var oParent = document.getElementById("body_content");
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = fad.offsetHeight;
Woffset = fad.offsetWidth;
if (y) 
{
yPos = yPos + step;
}
else 
{
yPos = yPos - step;
}
if (yPos < 0) 
{
y = 1;
yPos = 0;
}
if (yPos >= (height - Hoffset)) 
{
y = 0;
yPos = (height - Hoffset);
}
if (x) 
{
xPos = xPos + step;
}
else 
{
xPos = xPos - step;
}
if (xPos < 0) 
{
x = 1;
xPos = 0;
}
if (xPos >= (width - Woffset)) 
{
x = 0;
xPos = (width - Woffset);
}
fad.style.left = xPos + document.body.scrollLeft;
fad.style.top = yPos + document.body.scrollTop;
}

function start_ad() 
{
pause_resume();
fad = document.getElementById("fad");
fad.style.left= xPos;
fad.style.top = yPos;
//fad.visibility = "visible";
fad.style.display="";
interval = setInterval('changePos()', delay);
}

function pause_resume() 
{
clearInterval(interval);
}
//start();
//-->