var speed=20; //ԽٶԽ 
var tab=document.getElementById("demo"); 
var tab1=document.getElementById("demo1"); 
var tab2=document.getElementById("demo2"); 
tab2.innerHTML=tab1.innerHTML; 
function Marquee(){ 
if(tab2.offsetWidth-tab.scrollLeft<=0) 
tab.scrollLeft-=tab1.offsetWidth 
else{ 
tab.scrollLeft++; 
} 
} 
var MyMar=setInterval(Marquee,speed); 
tab.onmouseover=function() {clearInterval(MyMar)}; 
tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)}; 

//лʼ
function myopen(myobj,myclass,mytab)
{
  document.getElementById("tab_1").style.display="none";
  document.getElementById("tab_2").style.display="none";
  document.getElementById("tab_3").style.display="none";
  document.getElementById("tab_4").style.display="none";
  document.getElementById("a1").className="b";
  document.getElementById("a2").className="b";
  
  document.getElementById(myobj).style.display="";
  document.getElementById(mytab).style.display="";
  myclass.className="a"; 
   
}
//л


var rollspeed=70
rolllink2.innerHTML=rolllink1.innerHTML
function Marquee2(){
if(rolllink2.offsetTop-rolllink.scrollTop<=0)
rolllink.scrollTop-=rolllink1.offsetHeight
else{
rolllink.scrollTop++
}
}
var MyMar2=setInterval(Marquee2,rollspeed)
rolllink.onmouseover=function() {clearInterval(MyMar2)}
rolllink.onmouseout=function() {MyMar2=setInterval(Marquee2,rollspeed)}