//添加事件响应函数的函数
function addEventSimple(obj,evt,fn){
	if(obj.addEventListener){
		obj.addEventListener(evt,fn,false);
	}else if(obj.attachEvent){
		obj.attachEvent('on'+evt,fn);
	}
}
addEventSimple(window,'load',initScrolling);
var contentHeight;
var scrollingBox;
var scrollingInterval;
//1.初始化滚动新闻
function initScrolling(){
	scrollingBox = document.getElementById("scrollText");
	scrollingBox.style.height = "145px";
	scrollingBox.style.overflow = "hidden";
	scrollingInterval = setInterval("scrolling()",50);
	scrollingBox.onmouseover = over;
	scrollingBox.onmouseout = out;	
}
//3.滚动效果
function scrolling(){
	//开始滚动,origin是原来scrollTop
	var origin = scrollingBox.scrollTop++;
	//如果到底了
	if(origin == scrollingBox.scrollTop){
		//延时固定时间后返回顶部
		setTimeout("scrollingBox.scrollTop=0",10)
	}
}
function over(){
	clearInterval(scrollingInterval);
}
function out(){
	scrollingInterval = setInterval("scrolling()",50);
}