var tips;
var theTop = 40;
var old = theTop;
function initFloatTips()
{
	tips = document.getElementById('qqbox');
	moveTips();
}
function moveTips()
{
	var tt = 50;
	if (window.innerHeight) {
		pos = window.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop) {
		pos = document.documentElement.scrollTop;
	} else if (document.body) {
		pos = document.body.scrollTop;
	}
	pos=pos-tips.offsetTop+theTop;
	pos=tips.offsetTop+pos/10;
	if (pos < theTop) {
		pos = theTop;
	}
	if (pos != old) {
		tips.style.top = pos + "px";
		tt = 10;
	}
	old = pos;
	setTimeout(moveTips,tt);
}
initFloatTips();
//给firefox定义contains()方法，ie下不起作用
if(typeof(HTMLElement) != "undefined") {
	HTMLElement.prototype.contains = function(obj) {
		//通过循环对比来判断是不是obj的父元素
		while(obj!=null&&typeof(obj.tagName)!="undefind") {
			if(obj == this) {
				return true;
			}
			obj = obj.parentNode;
		}
		return false;
	}
}