function setGoTopBtn(){
	var obj;
	if(obj = getObjById("go-pagetop")){
		if(window.pageYOffset){
			obj.style.top = window.pageYOffset + innerHeight - 29 + "px";
			obj.style.visibility = "visible";
		}else if(document.documentElement.scrollTop){
			obj.style.top = document.documentElement.scrollTop + document.documentElement.clientHeight - 29 + "px";
			obj.style.visibility = "visible";
		}else{
			obj.style.visibility = "hidden";
		}
		setTimeout("setGoTopBtn()",300);
	}
}