function next(elem){    
        do{    
            elem=elem.nextsibling;    
        }while(elem&&elem.nodetype!=1);    
        return elem;    
    }    
    //---鏌ユ壘绗竴涓瓙鍏冪礌鐨勫嚱鏁?--//    
    function first(elem){    
        elem=elem.firstchild;    
        return elem && elem.nodetype!=1?next(elem):elem;    
    }
	
	var marquee = {
		init : function(id,tofollow,speed){
			this.speed = speed || 5;
			this.boxid = id;
			this.tofollow=tofollow;
			this.scrollbox = document.getelementbyid(id);
			
			if(this.tofollow=="top"||this.tofollow=="bottom"){
				this.appendbox=first(this.scrollbox).clonenode(true);
				this.scrollbox.appendchild(this.appendbox);
			}else{
				var templateleft = "<table cellspacing='0' cellpadding='0' style='border-collapse:collapse;display:inline;'><tr><td nowrap=true style='white-space: nowrap;word-break:keep-all;'>"+this.scrollbox.innerhtml+"</td><td nowrap=true style='white-space: nowrap;word-break:keep-all;'>"+this.scrollbox.innerhtml+"</td></tr></table>";
				this.scrollbox.innerhtml=templateleft;
				this.appendbox=first(first(first(first(this.scrollbox))));
			}
			this.objs = {
				scrollbox : this.scrollbox,
				appendbox : this.appendbox,
				tofollow : this.tofollow,
				speed : this.speed,
				id : this.boxid
			};
			return this;
		},

		scrollup : function(){
			var self = this.objs;
			self.begin = function(){
				if(self['tofollow']=="top"){
					self.doscr = setinterval(function(){
						if(self['appendbox'].offsetheight<=self['scrollbox'].scrolltop){
							self['scrollbox'].scrolltop-=first(self['scrollbox']).offsetheight;
						}else{
							self['scrollbox'].scrolltop++;
						}
					},self.speed);
				}else if(self['tofollow']=="bottom"){
				self.doscr = setinterval(function(){
					if(self['scrollbox'].scrolltop<=0){
						self['scrollbox'].scrolltop=self['appendbox'].offsetheight;
					}else{
						self['scrollbox'].scrolltop--;
					}
				},self.speed);
			}else if(self['tofollow']=="left"){
				self.doscr = setinterval(function(){
					if(self['appendbox'].offsetwidth<=self['scrollbox'].scrollleft){
						self['scrollbox'].scrollleft-=self['appendbox'].offsetwidth;
					}else{
						self['scrollbox'].scrollleft++;
					}
				},self.speed);
			}else if(self['tofollow']=="right"){
				self.doscr = setinterval(function(){
					if(self['scrollbox'].scrollleft<=0){
						self['scrollbox'].scrollleft=self['appendbox'].offsetwidth;
					}else{
						self['scrollbox'].scrollleft--;
					}
					
				},self.speed);
				
			}
			}
			self.begin();
			self.scrollbox.onmouseover = function(){
				clearinterval(self.doscr);
			}
			self.scrollbox.onmouseout = function(){
				self.begin();
			}
		}
	}

//	marquee.init("demo","top").scrollup();
//	marquee.init("demo2","bottom", 50).scrollup();
//	marquee.init("demo3","left").scrollup();
//	marquee.init("demo4","right", 50).scrollup();