(function(ul, delay, speed, lineHeight) {
var slideBox = (typeof ul == 'string')?document.getElementById(ul):ul;
var delay = delay||1000;
var speed=speed||20;
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', 3000, 1, 30);