/*
 * 	Easy Slider - jQuery plugin
 *	written by Alen Grakalic	
 *	http://cssglobe.com/post/3783/jquery-plugin-easy-image-or-content-slider
 *
 *	Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
 *	Dual licensed under the MIT (MIT-LICENSE.txt)
 *	and GPL (GPL-LICENSE.txt) licenses.
 *
 *	Built for jQuery library
 *	http://jquery.com
 *
 */

(function($) {
		  
	$.fn.easySlider = function(options){
	  
		// default configuration properties
		var defaults = {
			prevId: 		'prevBtn',
			prevText: 		'Previous',
			nextId: 		'nextBtn',	
			nextText: 		'Next',
			orientation:	'', //  'vertical' is optional;
			speed: 			800			
		}; 
		
		var options = $.extend(defaults, options);  
		
		return this.each(function() {  
			obj = $(this); 	//obj es el container -> DIVtabsCenter
			var s = $("li", obj).length; //s es la cantidad de li's dentro del container. 
			var w = obj.width(); 
			var h = obj.height(); 
			var ts = s-1;
			var t = 0;
			var vertical = (options.orientation == 'vertical');
			$("ul", obj).css('width',s*w);			
			if(!vertical) $("li", obj).css('float','left');
			$(obj).after('<span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span> <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>');		
			//$("a","#"+options.prevId).hide(); -> no esconder botones
			//$("a","#"+options.nextId).hide(); -> no esconder botones
			
			$("a","#"+options.nextId).click(function(){		
				animate("next");
				//if (t>=ts) $(this).fadeOut(); -> no esconder botones
				$("a","#"+options.prevId).fadeIn();  //habilita el previous cuando ya camino para la derecha
			});
			
			$("a","#"+options.prevId).click(function(){		
				animate("prev");
				//if (t<=0) $(this).fadeOut(); -> no hay que hacerle fade out, no hace falta, el boton permanece
				$("a","#"+options.nextId).fadeIn();
			});
			
			function animate(dir){
				if(dir == "next"){
					t = (t>=ts) ? ts : t+1;	
				} else {
					t = (t<=0) ? 0 : t-1;
					
			
			  };		
				
				if(t==0){
					$("a","#"+options.prevId).css('background-position','0 top');
					$("a","#"+options.nextId).css('background-position','0 bottom');
				}else{
					$("a","#"+options.prevId).css('background-position','0 bottom');
					$("a","#"+options.nextId).css('background-position','0 top');
				}
				  
				
				if(!vertical) {
					p = (t*w*-1);
					$("ul",obj).animate(
						{ marginLeft: p }, 
						options.speed
					);				
				} else {
					p = (t*h*-1);
					$("ul",obj).animate(
						{ marginTop: p }, 
						options.speed
					);					
				}
			};
			//if(s>1) $("a","#"+options.nextId).fadeIn(); -> No hace falta, estan fijos
		});
	  
	};

})(jQuery);