function floatBanner(){
	var t = document.body.scrollTop;
	obj = document.getElementById("banner");
	if (obj.style){
		obj = obj.style;
	}
	if (t > 265){
		if (document.all){
			obj.position = 'absolute';
			obj.top = t;
		}else{
			obj.position = 'fixed';
			obj.top = 0;
		}
		obj.left = 0;
	}else{
		obj.position = '';
	}
}
window.onscroll = floatBanner;