//友情链接上下移动
var speed=50; //数字越大速度越慢 
var tab1=document.getElementById("messageMove1"); 
var tab2=document.getElementById("messageMove2"); 
var tab3=document.getElementById("messageMove3"); 
tab3.innerHTML=tab2.innerHTML; 
function Marquee(){ 
    if(tab3.offsetHeight>=87)
    {
        if((tab3.offsetHeight-tab1.scrollTop<=0)) 
        tab1.scrollTop-=tab2.offsetHeight; 
        else{ 
        tab1.scrollTop++;
        }
    }
    else
    {
       tab3.style.display='none';
    }
}
var MyMar=setInterval(Marquee,speed); 
tab1.onmouseover=function() {clearInterval(MyMar)}; 
tab1.onmouseout=function() {MyMar=setInterval(Marquee,speed)};