function scrollbox(box) {
	this.box = $("#" + box);
	this.name = "li左右滚动类";
	this.author = "keboy";
	this.version = "v1.0";
	this.createdate = "2009-12-15";
}
scrollbox.prototype = {
	clientwidth: 0,
	space: 0,
	step: 0,
	defstep: 0,
	speed: 0,
	forward: "",
	norecord: "",
	control: false,
	ctrlclass: "",
	stop: true,
	defaulthtml: "",
	defaulti: 1,
	gocross: 0,
	ctrlspeed: 0,
	default: function() {
		var _this = this;
		this.defaulthtml = this.box.find("ul:first").html();
		this.defstep = this.step;
		this.box.css("overflow","hidden").find("li").each( function() {
			_this.gocross += ( $(this).get(0).offsetwidth + _this.space );
		} );
		this.setdefault();
	},
	setdefault: function() {
		var _this = this;
		var li = this.box.find("li");
		if ( li.length > 0 ) {
			var liwidth = 0;
			li.each( function() {
				liwidth += ( $(this).get(0).offsetwidth + _this.space );
			} );
			if ( liwidth >= 2 * this.clientwidth ) {
				var endhtml = this.box.find("ul:first").html();
				endhtml += endhtml;
				this.box.find("ul:first").html(endhtml).css("width",liwidth * 2 + "px");
				this.start();
			}
			else {
				var newhtml = "";
				for ( var i = 0 ; i < this.defaulti ; i++ ) {
					newhtml += this.defaulthtml;
				}
				this.defaulti++;
				this.box.find("ul:first").html(newhtml);
				this.setdefault();
			}
		}
		else {
			this.box.find("ul:first").html(this.norecord);
		}
	},
	start: function() {
		var _this = this;
		var mar = setinterval(getscroll,this.speed);
		function getscroll() {
			if ( _this.forward == "left" ) {
				if ( _this.box.get(0).scrollleft > _this.gocross ) {
					_this.box.get(0).scrollleft -= _this.gocross;
				}
				else {
					_this.box.get(0).scrollleft += _this.step;
				}
			}
			else if ( _this.forward == "right" ) {
				if ( _this.box.get(0).scrollleft <= 0 ) {
					_this.box.get(0).scrollleft += _this.gocross;
				}
				else {
					_this.box.get(0).scrollleft -= _this.step;
				}
			}
		}
		if ( this.control ) {
			$("." + this.ctrlclass).css("cursor","pointer");
			$("." + this.ctrlclass + ":first").mouseover( function() {
				_this.forward = "left";
			} ).mousedown( function() {
				_this.step = _this.defstep * _this.ctrlspeed;
			} );
			$("." + this.ctrlclass + ":last").mouseover( function() {
				_this.forward = "right";
			} ).mousedown( function() {
				_this.step = _this.defstep * _this.ctrlspeed;
			} );
			$(document).mouseup( function() {
				_this.step = _this.defstep;
			} );
		}
		if ( this.stop ) {
			this.box.mouseover( function() {
				clearinterval(mar);
			} ).mouseout( function() {
				mar = setinterval(getscroll,_this.speed);
			} );
		}
	}
};