function dhscroll(){
	//author:dh20156
	var dh = this;
	this.autoid = null;
	//块1
	this.scrollDOM = null;
	//块2
	this.scrollCDOM = null;
	//展示宽度（和块1宽度一致）
	this.showwidth = 0;
	//每次滚动长度
	this.steplength = 1;
	var oldlength = this.steplength;
	//滚动时间间隔
	this.steptime = 1;
	//停顿时间
	this.resttime = 3000;
	//滚动长度
	this.uvwidth = 0;

	//无缝设置过程
	this.getsw = function(){
		var tempw = this.scrollCDOM.offsetWidth;
		var temps = this.scrollCDOM.innerHTML;
		this.scrollCDOM.innerHTML = [temps,temps].join("");
		this.scrollCDOM.style.width = tempw*2+"px";
		if(document.attachEvent){
			this.scrollDOM.attachEvent("onmouseover",dh.pause);
			this.scrollDOM.attachEvent("onmouseout",dh.goon);
		}else{
			this.scrollDOM.addEventListener("mouseover",dh.pause,true);
			this.scrollDOM.addEventListener("mouseout",dh.goon,true);
		}
		this.uvwidth = Math.ceil(this.scrollDOM.scrollWidth / 2);;
	}

	//从右到左
	this.scrollleft = function(){
		if(this.autoid!=null){
			window.clearTimeout(this.autoid);
		}
		var uvleft = this.scrollDOM.scrollLeft;
		uvleft += this.steplength;

		this.scrollDOM.scrollLeft = uvleft;

		if(uvleft>=this.uvwidth){
			this.scrollDOM.scrollLeft = 0;
		}

		if(uvleft % this.showwidth == 0){
			this.autoid = window.setTimeout(function(){dh.scrollleft()},dh.resttime);
		}else{
			this.autoid = window.setTimeout(function(){dh.scrollleft()},dh.steptime);
		}
	}

	//从左到右
	this.scrollright = function(){
		if(this.autoid!=null){
			window.clearTimeout(this.autoid);
		}
		var uvleft = this.scrollDOM.scrollLeft;
		uvleft -= this.steplength;

		this.scrollDOM.scrollLeft = uvleft;

		if(uvleft <= 0){
			this.scrollDOM.scrollLeft = this.uvwidth;
		}

		if(uvleft % this.showwidth == 0){
			this.autoid = window.setTimeout(function(){dh.scrollright()},dh.resttime);
		}else{
			this.autoid = window.setTimeout(function(){dh.scrollright()},dh.steptime);
		}
	}

	//开始滚动，参数为方向，首屏是否停顿
	this.go = function(direction,rest){
		if(this.autoid!=null){
			window.clearTimeout(this.autoid);
		}
		if(direction=="left"){
			if(rest){
				this.autoid = window.setTimeout(function(){dh.scrollleft()},5000);
			}else{
				dh.scrollleft();
			}
		}else{
			if(rest){
				this.autoid = window.setTimeout(function(){dh.scrollright()},5000);
			}else{
				dh.scrollright();
			}
		}
	}

	//往右
	this.pre = function(){
			this.scrollright();
	}
	//往左
	this.next = function(){
			this.scrollleft();
	}
	//暂停
	this.pause = function(){
		dh.oldlength = dh.steplength;
		dh.steplength = 0;
	}
	//继续
	this.goon = function(){
		dh.steplength = dh.oldlength;
	}
}