(function(ul, delay, speed, lineHeight) { 
var slideBox = (typeof ul == 'string')?document.getElementById(ul):ul; 
var delay = delay||1000; 
var speed=speed||40; 
var lineHeight = lineHeight||20; 
    var tid = null, pause = false; 
    var start = function() { 
     tid=setInterval(slide, speed); 
    } 
    var slide = function() { 
     if (pause) return; 
     slideBox.scrollTop += 2; 
     if (slideBox.scrollTop % lineHeight == 0) { 
         clearInterval(tid); 
         slideBox.appendChild(slideBox.getElementsByTagName('li')[0]); 
         slideBox.scrollTop = 0; 
         setTimeout(start, delay); 
        } 
    } 
    slideBox.onmouseover=function(){pause=true;} 
    slideBox.onmouseout=function(){pause=false;} 
    setTimeout(start, 2000); 
})('IssueList', 2000, 4, 20);