function start() 
{

    var sWidth = document.documentElement.clientWidth;
    var sHeight = document.documentElement.clientHeight;
	    
	var oWidth = img.offsetWidth;
	var oHeight = img.offsetHeight;
	
    var scTop= document.documentElement.scrollTop;
	
	img.style.left = sWidth - oWidth;
	img.style.top = sHeight - oHeight + scTop;

    if(tongZhi.innerHTML == "")
    {
        Hidden();
    } 
    setTimeout('start()',500);       
}

function Hidden()
{
    img.style.display='none';  
    return;
}