// JScript 文件
function next(elem){    
    do{    
        elem=elem.nextSibling;    
    }while(elem&&elem.nodeType!=1);    
    return elem;    
}    
//---查找第一个子元素的函数---//    
function first(elem){    
    elem=elem.firstChild;    
    return elem && elem.nodeType!=1?next(elem):elem;    
}

var Marquee = {
	init : function(id,toFollow,speed){
		this.speed = speed || 10;
		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();
		}
	}

}