function marquee(height,speed,delay){
var scrollT;
var pause = false;
var ScrollBox = document.getElementById("shangfan");
//if(document.getElementById("holder").offsetHeight <= height) return;
var _tmp = ScrollBox.innerHTML.replace('holder', 'holder2')
ScrollBox.innerHTML += _tmp;
ScrollBox.onmouseover = function(){pause = true}
ScrollBox.onmouseout = function(){pause = false}
ScrollBox.scrollTop = 0;
function start(){
     scrollT = setInterval(scrolling,speed);
     if(!pause) ScrollBox.scrollTop += 2;
}
function scrolling(){
     if(ScrollBox.scrollTop % height != 0){
         ScrollBox.scrollTop += 2;
         if(ScrollBox.scrollTop >= ScrollBox.scrollHeight/2) ScrollBox.scrollTop = 0;
     }
   else{
         clearInterval(scrollT);
         setTimeout(start,delay);
     }
}
setTimeout(start,delay);
}
marquee(24,30,3000);