function gundong(){
	var speed=25; //����խ���ٶ�խ��
	var tabe=document.getelementbyid("demo");
	var tab1=document.getelementbyid("demo1");
	var tab2=document.getelementbyid("demo2");
	tab2.innerhtml=tab1.innerhtml;
	function marqueee(){
    	if(tab2.offsetwidth-tabe.scrollleft<=0)
    	tabe.scrollleft-=tab1.offsetwidth;
    	else{
    		tabe.scrollleft++;
    	}
    }
	var mymar=setinterval(marqueee,speed);
    tabe.onmouseover=function() {clearinterval(mymar)};
    tabe.onmouseout=function() {mymar=setinterval(marqueee,speed)};
	}
	
function gundonga(){
var speeda=25; //����խ���ٶ�խ��
var taba=document.getelementbyid("demoa");
var taba1=document.getelementbyid("demoa1");
var taba2=document.getelementbyid("demoa2");
	taba2.innerhtml=taba1.innerhtml;
	function marqueea(){
    	if(taba2.offsetwidth-taba.scrollleft<=0)
    	taba.scrollleft-=taba1.offsetwidth
    	else{
    		taba.scrollleft++;
    	}
    }
	var mymara=setinterval(marqueea,speeda);
    taba.onmouseover=function() {clearinterval(mymara)};
    taba.onmouseout=function() {mymara=setinterval(marqueea,speeda)};
}