<SCRIPT language=JavaScript>  
var currentpos,timer;  

function initialize()  
{  
timer=setInterval("scrollwindow()",10);  
}  
function sc(){  
clearInterval(timer);  
}  
function scrollwindow()  
{  
currentpos=document.body.scrollTop;  
window.scroll(0,++currentpos);  
if (currentpos != document.body.scrollTop)  
sc();  
}  
document.onmousedown=sc  
document.ondblclick=initialize  
</script>