// JavaScript Document
var stopscroll = false;
var scrollElem = document.getElementById("studyscroll");
var marqueesHeight = scrollElem.style.height;
scrollElem.onmouseover = new Function('stopscroll = true');
scrollElem.onmouseout  = new Function('stopscroll = false');
var preTop = 0;
var currentTop = 0;
var stoptime = 0;
var leftElem = document.getElementById("scrollms"); 
scrollElem.appendChild(leftElem.cloneNode(true));
init_srolltext();
function init_srolltext(){
	scrollElem.scrollTop = 0;
	setInterval('scrollUp()', 70);//的面的这个参数25, 是确定滚动速度的, 数值越小, 速度越快
}
function scrollUp(){
	if(stopscroll) return;
	currentTop += 2; //设为1, 可以实现间歇式的滚动; 设为2, 则是连续滚动
	if(currentTop == 19) {
		stoptime += 1;
		currentTop -= 1;
		if(stoptime == 180) {
			currentTop = 0;
			stoptime = 0;
		}
	}else{
		preTop = scrollElem.scrollTop;
		scrollElem.scrollTop += 1;
		if(preTop == scrollElem.scrollTop){
			scrollElem.scrollTop = 0;
			scrollElem.scrollTop += 1;
		}
	}
}