var xPos1 = 300;
var yPos1 = 200;
var step1 = 1;
var delay1 = 30;
var height1 = 0;
var Hoffset1 = 0;
var Woffset1 = 0;
var yon1 = 0;
var xon1 = 0;
var pause1 = true;
var interval1;

document.getElementById("img1").style.top = yPos1;


function changePos()
{
	var imgobj=document.getElementById("img1");
	var testobj=document.getElementById("test1");
	
	width1 = document.body.clientWidth;
	height1 = document.documentElement.clientHeight;
	
	
	Hoffset1 = imgobj.offsetHeight;
	Woffset1 = imgobj.offsetWidth;
	
	imgobj.style.left = xPos1 + document.body.scrollLeft+"px";
	imgobj.style.top = yPos1 + document.body.scrollTop+"px";
	
	


	//	alert("yon1=" + yon1 + " height1=" + height1 + " yPos1=" + yPos1 + " Hoffset1=" + Hoffset1);
	if (yon1)
	{yPos1 = yPos1 + step1;}
	else
	{yPos1 = yPos1 - step1;}
	
	if (yPos1 <= 0)
	{yon1 = 1;yPos1 = 0;}
	
	if (yPos1 >= (height1 - Hoffset1))
	{ yon1 = 0; yPos1 = (height1 - Hoffset1); }


	if (xon1)
	{xPos1 = xPos1 + step1;}
	else
	{xPos1 = xPos1 - step1;}
	
	if (xPos1 <= 0)
	{xon1 = 1;xPos1 = 0;}
	
	if (xPos1 >= (width1 - Woffset1))
	{xon1 = 0;xPos1 = (width1 - Woffset1);   }
}

function start()
{
	document.getElementById("img1").visibility = "visible";
	interval = setInterval('changePos()', delay1);
}
start();