var xPos = 300;
var yPos = 100; 
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;
img1.style.top = yPos;
var Cwidth=0;
var Cheight=0;
function GetWindow()
{
  	Hoffset = img1.offsetHeight;
	Woffset = img1.offsetWidth;
}
GetWindow();
function changePos() 
{
   if(IfFloat)
   {
    Cwidth= document.documentElement.clientWidth;
    Cheight= document.documentElement.clientHeight;
    width=Cwidth;
	height = Cheight;
//	img1.style.left = xPos + document.documentElement.scrollLeft;
//	img1.style.top = yPos + document.documentElement.scrollTop;
    var top=document.documentElement.scrollTop;
    var lef=document.documentElement.scrollLeft;

   img1.style.left = xPos ;
   img1.style.top = yPos
	if (yon) 
		{yPos = yPos + step;}
	else 
		{yPos = yPos - step;}
	if (yPos < 0+top) 
		{yon = 1;yPos = 0+top;}
	if (yPos >= (height+top - Hoffset)) 
		{yon = 0;yPos = (height+top - Hoffset);}
//   if(yPos>500)
//   {yon=0;}
	if (xon) 
		{xPos = xPos + step;}
	else 
		{xPos = xPos - step;}
	if (xPos < 0+lef) 
		{xon = 1;xPos = 0+lef;}
	if (xPos >= (width+lef - Woffset)) 
		{xon = 0;xPos = (width+lef - Woffset);   }
	 }
	}
	
	function start()
	 {
	 	img1.visibility = "visible";
		interval = setInterval('changePos()', delay);
	}
	function pause_resume() 
	{
		if(pause) 
		{
			clearInterval(interval);
			pause = false;}
		else 
		{
			interval = setTimeOut('changePos()',delay);
			pause = true; 
			}
		}
	start();
	var IfFloat=true;
   function access()
    {
     IfFloat=false;
    }
    
    function out()
    {
      IfFloat=true;
    }

    function bbb()
    {
     img1.style.display="none";
    }