var xPos = 300;
var yPos = 200; 
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;
pp.style.top = yPos;
function changePos() 
{
	width = document.body.clientWidth;
	height = document.body.clientHeight;
	Hoffset = pp.offsetHeight;
	Woffset = pp.offsetWidth;
	pp.style.left = xPos + document.body.scrollLeft;
	pp.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()
{
    pp.visibility = "visible";
    interval = setInterval('changePos()', delay);
}
function pause_resume() 
{
    if(pause) 
    {
	    clearInterval(interval);
	    pause = false;
	}
    else 
    {
	    interval = setInterval('changePos()',delay);
	    pause = true; 
    }
}
start();