(function($) {	
	
	$.fn.slider = function(options) {
	  		
		var defaults = {		
			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.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');
			
			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));
				}
			};
			
			function animate(dir){
				var ot = t;				
				switch(dir){
					case "next":
						t = (ot>=ts) ? (options.continuous ? t+1 : ts) : t+1;						
						break; 
					case "prev":
						t = (t<=0) ? (options.continuous ? t-1 : 0) : t-1;
						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(options.auto && dir == "next") {
					timeout = setTimeout(function(){
						animate("next");
					},diff*options.speed+options.pause);
				};
			};

			// init
			var timeout;
			if(options.auto){;
				timeout = setTimeout(function(){
					animate("next");
				},options.pause);
			};	
		});
	  
	};

})(jQuery);