(function($) {
	$.fn.slider = function(options){
		// default configuration properties
		var defaults = {
			prevId: 		'prevBtn',
			prevText: 		'Previous',
			nextId: 		'nextBtn',
			nextText: 		'Next',
			controlsShow:	false,
			controlsBefore:	'',
			controlsAfter:	'',
			controlsFade:	true,
			firstId: 		'firstBtn',
			firstText: 		'First',
			firstShow:		false,
			lastId: 		'lastBtn',
			lastText: 		'Last',
			lastShow:		false,
			vertical:		false,
			speed: 			800,
			auto:			true,
			pause:			2000,
			continuous:		true
		};
		var options = $.extend(defaults, options);
		this.each(function() {
			var obj = $(this);
			var s = $("li", obj).length;
			var w = $("li", obj).width();
			var h = $("li", obj).height();
			obj.width(w);
			obj.height(h);
			obj.css("overflow","hidden");
			var ts = s-1;
			var t = 0;
			$("ul", obj).css('width',s*w);
			if(!options.vertical) $("li", obj).css('float','left');
			if(options.controlsShow){
				var html = options.controlsBefore;
				if(options.firstShow) html += '<span id="'+ options.firstId +'"><a href=\"javascript:void(0);\">'+ options.firstText +'</a></span>';
				html += ' <span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span>';
				html += ' <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>';
				if(options.lastShow) html += ' <span id="'+ options.lastId +'"><a href=\"javascript:void(0);\">'+ options.lastText +'</a></span>';
				html += options.controlsAfter;
				$(obj).after(html);
			};
			$("a","#"+options.nextId).click(function(){animate("next",true);});
			$("a","#"+options.prevId).click(function(){animate("prev",true);});
			$("a","#"+options.firstId).click(function(){animate("first",true);});
			$("a","#"+options.lastId).click(function(){animate("last",true);});
			function animate(dir,clicked){
				var ot = t;
				switch(dir){case "next":t = (ot>=ts) ? (options.continuous ? 0 : ts) : t+1;break;case "prev":t = (t<=0) ? (options.continuous ? ts : 0) : t-1;break;case "first":t = 0;break;case "last":t = ts;break;default:break;};
				var diff = Math.abs(ot-t);
				var speed = diff*options.speed;
				if(!options.vertical) {p = (t*w*-1);$("ul",obj).animate({ marginLeft: p },speed);} else {p = (t*h*-1);$("ul",obj).animate({ marginTop: p },speed);};
				if(!options.continuous && options.controlsFade){if(t==ts){$("a","#"+options.nextId).hide();$("a","#"+options.lastId).hide();} else {$("a","#"+options.nextId).show();$("a","#"+options.lastId).show();};if(t==0){$("a","#"+options.prevId).hide();$("a","#"+options.firstId).hide();} else {$("a","#"+options.prevId).show();$("a","#"+options.firstId).show();};};
				if(clicked) clearTimeout(timeout);
				if(options.auto && dir=="next" && !clicked){timeout = setTimeout(function(){animate("next",false);},diff*options.speed+options.pause);};
			};
			// init
			var timeout;
			if(options.auto){timeout = setTimeout(function(){animate("next",false);},options.pause);};
			if(!options.continuous && options.controlsFade){$("a","#"+options.prevId).hide();$("a","#"+options.firstId).hide();};
		});
	};
})(jQuery);