var getById=function(id){return "string"==typeof id?document.getElementById(id):id};var Class={create:function(){return function(){this.initialize.apply(this,arguments)}}};Object.extend=function(destination,source){for(var property in source){destination[property]=source[property]}return destination};function addEventHandler(oTarget,sEventType,fnHandler){if(oTarget.addEventListener){oTarget.addEventListener(sEventType,fnHandler,false)}else if(oTarget.attachEvent){oTarget.attachEvent("on"+sEventType,fnHandler)}else{oTarget["on"+sEventType]=fnHandler}};var Scroller=Class.create();Scroller.prototype={initialize:function(idScroller,idScrollMid,options){var oScroll=this,oScroller=getById(idScroller),oScrollMid=getById(idScrollMid);this.heightScroller=oScroller.offsetHeight;this.heightList=oScrollMid.offsetHeight;if(this.heightList<=this.heightScroller)return;oScroller.style.overflow="hidden";oScrollMid.appendChild(oScrollMid.cloneNode(true));this.oScroller=oScroller;this.timer=null;this.SetOptions(options);this.side=1;switch(this.options.Side){case"down":this.side=-1;break;case"up":default:this.side=1};addEventHandler(oScrollMid,"mouseover",function(){oScroll.Stop()});addEventHandler(oScrollMid,"mouseout",function(){oScroll.Start()});if(this.options.PauseStep<=0||this.options.PauseHeight<=0)this.options.PauseStep=this.options.PauseHeight=0;this.Pause=0;this.Start()},SetOptions:function(options){this.options={Step:1,Time:20,Side:"up",PauseHeight:0,PauseStep:2000};Object.extend(this.options,options||{})},Scroll:function(){var iScroll=this.oScroller.scrollTop,iHeight=this.heightList,time=this.options.Time,oScroll=this,iStep=this.options.Step*this.side;if(this.side>0){if(iScroll>=(iHeight*2-this.heightScroller)){iScroll-=iHeight}}else{if(iScroll<=0){iScroll+=iHeight}}if(this.options.PauseHeight>0){if(this.Pause>=this.options.PauseHeight){time=this.options.PauseStep;this.Pause=0}else{this.Pause+=Math.abs(iStep);this.oScroller.scrollTop=iScroll+iStep}}else{this.oScroller.scrollTop=iScroll+iStep}this.timer=window.setTimeout(function(){oScroll.Scroll()},time)},Start:function(){this.Scroll()},Stop:function(){clearTimeout(this.timer)}};