Scroller = new Class({
	Implements: Options,
	options: {
		duration: 500,
		selectBy: "class",
		autostart: false,
		autostart_dir: "forward",
		sleep: 1000,
		transition: Fx.Transitions.Cubic.easeIn,
		leftm: 0,
		topm: 0
	},
	length: 0,
	initialize: function (windowElement, options) {
		this.setOptions(options);
		this.windowElement = windowElement;
		this.slideStrip = windowElement.getChildren()[0];
		this.cChildIdx = 0;
		this.fx = new Fx.Scroll(windowElement,{duration: this.options.duration, link: 'cancel', transition: this.options.transition});
		if (this.options.selectBy == "class") {
			this.childs = this.slideStrip.getElements(".slide");
		} else {
			this.childs = this.slideStrip.getChildren();
		}
		this.length = this.childs.length;
		this.periodicalID = 0;
		this.startdir = false;
		if (this.options.autostart == true) {
			if (this.options.autostart_dir != "back") {
				this.periodicalID = this.next.periodical(this.options.sleep+this.options.duration, this);
			} else {
				this.startdir = true;
				this.periodicalID = this.prev.periodical(this.options.sleep+this.options.duration, this);
			}
		}
	},
	updateTransition: function(opts) {
		this.setOptions(opts);
		this.fx.options.duration = this.options.duration;
		this.fx.options.transition = this.options.transision;
		if (this.periodicalID)
			this.restart();
	},
	stop: function() {
		if (this.periodicalID) {
			$clear(this.periodicalID);
			this.periodicalID = 0;
		}
	},
	start: function(back) {
		if (this.periodicalID) {
			$clear(this.periodicalID);
		}
		if (back) {
			this.startdir = true;
			this.periodicalID = this.prev.periodical(this.options.sleep+this.options.duration, this);
		} else {
			this.startdir = false;
			this.periodicalID = this.next.periodical(this.options.sleep+this.options.duration, this);
		}
	},
	next: function(stop){
		if (stop) this.stop();
		this.cChildIdx++;
		if (this.cChildIdx >= this.childs.length) {
			this.cChildIdx = 0;
		}
		this.gotoIdx();
	},
	restart: function() {
		this.stop();
		this.start(this.startdir);
	},
	prev: function(stop){
		if (stop) this.stop();
		this.cChildIdx--;
		if (this.cChildIdx < 0) {
			this.cChildIdx = this.childs.length-1;
		}
		this.gotoIdx();
	},
	gotoIdx: function () {
		var s = this.childs[this.cChildIdx];
		var bl = s.getStyle('border-left').toInt();
		if (isNaN(bl)) bl=0;
		var bt = s.getStyle('border-top').toInt();
		if (isNaN(bt)) bt=0;
		this.curTrans = this.fx.start(
						s.getCoordinates(this.windowElement)['left']-bl-this.options.leftm,
						s.getCoordinates(this.windowElement)['top']-bt-this.options.topm
						);
	}
});