//written by nathan faubion: http://n-son.com
//use this or edit how you want, just give me
//some credit!

function jsscroller (o, w, h) {
	var self = this;
	var list = o.getelementsbytagname("div");
	for (var i = 0; i < list.length; i++) {
		if (list[i].classname.indexof("scroller-container") > -1) {
			o = list[i];
		}
	}
	
	//private methods
	this._setpos = function (x, y) {
		if (x < this.viewablewidth - this.totalwidth) 
			x = this.viewablewidth - this.totalwidth;
		if (x > 0) x = 0;
		if (y < this.viewableheight - this.totalheight) 
			y = this.viewableheight - this.totalheight;
		if (y > 0) y = 0;
		this._x = x;
		this._y = y;
		with (o.style) {
			left = this._x +"px";
			top  = this._y +"px";
		}
	};
	
	//public methods
	this.reset = function () {
		this.content = o;
		this.totalheight = o.offsetheight;
		this.totalwidth	 = o.offsetwidth;
		this._x = 0;
		this._y = 0;
		with (o.style) {
			left = "0px";
			top  = "0px";
		}
	};
	this.scrollby = function (x, y) {
		this._setpos(this._x + x, this._y + y);
	};
	this.scrollto = function (x, y) {
		this._setpos(-x, -y);
	};
	this.stopscroll = function () {
		if (this.scrolltimer) window.clearinterval(this.scrolltimer);
	};
	this.startscroll = function (x, y) {
		this.stopscroll();
		this.scrolltimer = window.setinterval(
			function(){ self.scrollby(x, y); }, 40
		);
	};
	this.swapcontent = function (c, w, h) {
		o = c;
		var list = o.getelementsbytagname("div");
		for (var i = 0; i < list.length; i++) {
			if (list[i].classname.indexof("scroller-container") > -1) {
				o = list[i];
			}
		}
		if (w) this.viewablewidth  = w;
		if (h) this.viewableheight = h;
		this.reset();
	};
	
	//variables
	this.content = o;
	this.viewablewidth  = w;
	this.viewableheight = h;
	this.totalwidth	 = o.offsetwidth;
	this.totalheight = o.offsetheight;
	this.scrolltimer = null;
	this.reset();
};