(function($) {

	$.fn.slider = function(options){
	  
		// default configuration properties
		var defaults = {			
			prevId: 		'prevBtn',
			//prevText: 		'Previous',
			nextId: 		'nextBtn',	
			//nextText: 		'Next',
			posId:			'sliderpos',
			//controlsShow:	true,
			//controlsBefore:	'',
			//controlsAfter:	'',	
			//controlsFade:	true,
			firstId: 		'firstBtn',
			//firstText: 		'First',
			//firstShow:		false,
			lastId: 		'lastBtn',	
			//lastText: 		'Last',
			//lastShow:		false,				
			vertical:		false,
			speed: 			400,
			auto:			false,
			pause:			6000,
			continuous:		false//, 
			//numeric: 		false,
			//umericId: 		'controls'
		}; 
		
		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(); 
			var clickable = true;
			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.continuous){
				$("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-left","-"+ w +"px"));
				$("ul", obj).append($("ul li:nth-child(2)", obj).clone());
				$("ul", obj).css('width',(s+1)*w);
			};				
			
			if(!options.vertical) $("li", obj).css('float','left');


			
			
			$("#"+options.nextId).click(function(){		
				animate("next",true);
			});
			$("#"+options.prevId).click(function(){		
				animate("prev",true);				
			});
			$("#"+options.posId).click(function(){		
				animate(parseInt($("#"+options.posId).attr('rel')),false);				
			});

			function adjust(){
				if(t>ts) t=0;		
				if(t<0) t=ts;	
				if(!options.vertical) {
					$("ul",obj).css("margin-left",(t*w*-1));
				} else {
					$("ul",obj).css("margin-left",(t*h*-1));
				}
				clickable = true;

			};
			
			function animate(dir,clicked){
				if (clickable){
					clickable = false;
					var ot = t;
					switch(dir){
						case "next":
							t = (ot>=ts) ? (options.continuous ? t+1 : /*ts*/0) : t+1;
							break;
						case "prev":
							t = (t<=0) ? (options.continuous ? t-1 : /*0*/ts) : t-1;
							break; 
						case "first":
							t = 0;
							break;
						case "last":
							t = ts;
							break;
						default:
							t = dir;
							break;
					};
					var diff = Math.abs(ot-t);
					var speed = diff*options.speed;						
					if(!options.vertical) {
						p = (t*w*-1);
						$("ul",obj).animate(
							{ marginLeft: p }, 
							{ queue:false, duration:speed, complete:adjust }
						);
					} else {
						p = (t*h*-1);
						$("ul",obj).animate(
							{ marginTop: p }, 
							{ queue:false, duration:speed, complete:adjust }
						);
					};

					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);
			};

		
			
		});
	  
	};

})(jQuery);