function MoveLeftBanner()
{
	leftBanner = document.getElementById('left_banner');
	
	if(document.body.scrollTop == 0)
	{
		leftBanner.style.top=document.documentElement.scrollTop+"px" ;
	}
	else 
	{
		document.getElementById('left_banner').style.top=document.body.scrollTop +"px" ;
	}
}