function followBanner (div_id)
{
	var self	= document.getElementById(div_id);
		self.style.display = "block";

	var scroll_top	= (document.body.scrollTop)
					? parseInt(document.body.scrollTop, 10)
					: parseInt(document.documentElement.scrollTop, 10);
	
	var base	= document.getElementById("main_wrap");
	var max		= parseInt(base.clientHeight, 10);

	var t = self.style.top ? parseInt(self.style.top, 10) : 0;
	
	if (t!=scroll_top)
	{
		var g	= Math.ceil((t-scroll_top)/15);
			g	= g ? g : 0;
		
		if (max>scroll_top+parseInt(self.offsetHeight, 10))
		{
			self.style.top = (t-g) + "px";
		}
		else
		{
			self.style.top	= parseInt(max-self.offsetHeight, 10) + "px";
		}
	}

	setTimeout("followBanner('" + div_id + "');", 5);
}