var speed=40;  
marquePic2.innerHTML=marquePic1.innerHTML;  
function Marqueea(){  
//上移  
if(demoa.scrollTop>=marquePic1.scrollHeight)  
demoa.scrollTop=0;  
else  
demoa.scrollTop++;  

//左移  
//if(demoa.scrollLeft>=marquePic1.scrollWidth)  
// demoa.scrollLeft=0  
//else  
// demoa.scrollLeft++  
}  
var MyMarx=setInterval(Marqueea,60)  
//这里可以控制鼠标悬停效果 
demoa.onmouseover=function() {clearInterval(MyMarx)}  
demoa.onmouseout=function() {MyMarx=setInterval(Marqueea,60)}