// JS连续滚屏
	//author:梦猫猫
	//QQ:16991200
	//Created:2006-10-18
	//Updating:20080727
	//intro:
	/*
		marquee:滚动区域容器的ID，要求定义样式为无填充，无边框，overflow为hidden
		direction:滚动方向，值分别为：up,down,left,right
		delay:滚动的速度，值最小为1，值越小越快
		amount:滚动步进量，值最小为1，值越大越快
	*/
	//IE 6.0 测试通过
	//FireFox 1.5.0.7 测试通过
	//Opera 9.02 测试通过
	//NetScape 8.1 测试通过
	function Marquee(marquee,direction,delay,amount){
		this.marquee = document.getElementById(marquee);
		this.delay = delay;
		if(this.delay==null){
			this.delay = 1;
		}
		this.amount = amount;
		if(this.amount==null){
			this.amount = 1;
		}
		this.direction = direction;
		this.width = this.marquee.clientWidth;
		this.height = this.marquee.clientHeight;
		this.container = document.createElement("table");
		this.container.border=0;
		this.container.cellspacing="0"
		this.container.cellpadding="0"
		var _HTML = this.marquee.innerHTML;
		this.marquee.innerHTML = "";
		this.marquee.appendChild(this.container);
		var _tr = this.container.insertRow(this.container.rows.length);
		var _td = _tr.insertCell(_tr.cells.length);
		_td.innerHTML = _HTML;
		this.scrollHeight = this.container.clientHeight;
		this.scrollWidth = this.container.clientWidth;
		switch(this.direction.toLowerCase()){
			case "up":
			case "down":
				if(this.scrollHeight>=this.height){
					var _tr = this.container.insertRow(this.container.rows.length);
					var _td = _tr.insertCell(_tr.cells.length);
					_td.innerHTML = _HTML;
					this.scrollHeight = this.container.clientHeight;
				}
				if(this.direction.toLowerCase()=="down"){
					this.marquee.scrollTop=this.scrollHeight/2;
				}
				break;
			default:
				if(this.scrollWidth>=this.width){
					var _td = _tr.insertCell(_tr.cells.length);
					_td.innerHTML = _HTML;
					this.scrollWidth = this.container.clientWidth;
				}
				
		}
		
		this.marquee.m = this;
		
		this.intervalId = null;
		this.marquee.onmouseover = function (){
			this.m.Stop();
		}
		this.marquee.onmouseout = function (){
			this.m.Start();
		}
		this.Start();
	}
	Marquee.prototype.Start = function (){
		var _this = this;
		var _start = function ()
		{
			_this.Scroll();
		}
		this.intervalId = setInterval(_start,this.delay)
	}
	Marquee.prototype.Stop = function (sender){
		if(this.intervalId!=null){
			clearInterval(this.intervalId);
		}
	}
	Marquee.prototype.Scroll = function (){
		switch(this.direction.toLowerCase()){
			case "up":
				if((this.marquee.scrollTop+this.height)>=this.scrollHeight){
					this.marquee.scrollTop-=this.scrollHeight/2
				}
				if(this.scrollHeight>this.height){
					this.marquee.scrollTop+=this.amount;
				}
				break;
			case "down":
				if(this.marquee.scrollTop<=0){
					this.marquee.scrollTop+=this.scrollHeight/2
				}
				if(this.scrollHeight>this.height){
					this.marquee.scrollTop-=this.amount;
				}
				break;
			case "right":
				if(this.marquee.scrollLeft<=0){
					this.marquee.scrollLeft+=this.scrollWidth/2
				}
				if(this.scrollWidth>this.width){
					this.marquee.scrollLeft-=this.amount;
				}
				break;
			default:
				if((this.marquee.scrollLeft+this.width)>=this.scrollWidth){
					this.marquee.scrollLeft-=this.scrollWidth/2
				}
				if(this.scrollWidth>this.width){
					this.marquee.scrollLeft+=this.amount;
				}
		}
	}