//左右无缝滚动支持IE,fireFox
var dir = 1;//每步移动像素，大＝快
var speed = 25;//循环周期（毫秒）大＝慢
var MyMar;
var demo1;
var demo2;
var demo;
function Marquee(){//正常移动
	///alert(demo2.offsetWidth+"\n"+demo.scrollLeft)
	if (dir > 0  && (demo2.offsetWidth - demo.scrollLeft) <= 0) 
		demo.scrollLeft = 0;
	if (dir < 0 && (demo.scrollLeft <= 0)) 
		demo.scrollLeft = demo2.offsetWidth;
	demo.scrollLeft += dir;
	
	demo.onmouseover = function() {
		clearInterval(MyMar);
	}//暂停移动
	demo.onmouseout = function() {
		MyMar=setInterval(Marquee,speed);
	}//继续移动
}
function r_left(){if (dir = -1)dir = 1;}//换向左移
function r_right(){if (dir = 1)dir =-1;}//换向右移

function startScroll(){
	demo1 = document.getElementById("demo1");
	demo2 = document.getElementById("demo2");
	demo = document.getElementById("demo");
	if(demo.offsetWidth < demo1.offsetWidth){
		demo2.innerHTML = demo1.innerHTML;
		MyMar=setInterval(Marquee,speed);
	}
}

if(window.attachEvent){
    window.attachEvent("onload",  startScroll);
    //window.attachEvent("onresize",  iframeAutoFit);
}
else if(window.addEventListener){
    window.addEventListener('load',  startScroll,  false);
    //window.addEventListener('resize',  iframeAutoFit,  false);
}