this.easyscroll=function(){var id="myContent";var nav=['<img src="../static/images/arrow_top.jpg" alt="" />','<img src="../static/images/arrow_bottom.jpg" alt="" />'];var navId=["btnUp","btnDown"];var speed=2;var height=190;var obj=document.getElementById(id);obj.up=false;obj.down=false;obj.fast=false;var container=document.createElement("div");var parent=obj.parentNode;container.id="easyscroll";parent.insertBefore(container,obj);parent.removeChild(obj);container.style.position="relative";container.style.height=height+"px";container.style.overflow="hidden";obj.style.position="absolute";obj.style.top="0";obj.style.left="0";container.appendChild(obj);var btns=new Array();var ul=document.createElement("ul");ul.id="easyscrollnavup";var li1=document.createElement("li");li1.innerHTML=nav[0];li1.id=navId[0];btns.push(li1);ul.appendChild(li1);parent.insertBefore(ul,container);var ul1=document.createElement("ul");ul1.id="easyscrollnavdown";var li2=document.createElement("li");li2.innerHTML=nav[1];li2.id=navId[1];btns.push(li2);ul1.appendChild(li2);parent.appendChild(ul1,container);btns[0].onmouseover=function(){obj.up=true;this.className="over";};btns[0].onmouseout=function(){obj.up=false;this.className="";};btns[1].onmouseover=function(){obj.down=true;this.className="over";};btns[1].onmouseout=function(){obj.down=false;this.className="";};btns[0].onmousedown=btns[1].onmousedown=function(){obj.fast=true;};btns[0].onmouseup=btns[1].onmouseup=function(){obj.fast=false;};this.start=function(){var newTop;var objHeight=obj.offsetHeight;var top=obj.offsetTop;var fast=(obj.fast)?2:1;if(obj.down){newTop=((objHeight+top)>height)?top-(speed*fast):top;obj.style.top=newTop+"px";};if(obj.up){newTop=(top<0)?top+(speed*fast):top;obj.style.top=newTop+"px";};};obj.interval=setInterval("start()",50);};this.addEvent=function(obj,type,fn){if(obj.attachEvent){obj['e'+type+fn]=fn;obj[type+fn]=function(){obj['e'+type+fn](window.event);}
obj.attachEvent('on'+type,obj[type+fn]);}else{obj.addEventListener(type,fn,false);};};addEvent(window,"load",easyscroll);