/*
 * 	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
 *
 */
 
/*
 *	markup example for $("#images").easySlider();
 *	
 * 	<div id="images">
 *		<ul>
 *			<li><img src="images/01.jpg" alt="" /></li>
 *			<li><img src="images/02.jpg" alt="" /></li>
 *			<li><img src="images/03.jpg" alt="" /></li>
 *			<li><img src="images/04.jpg" alt="" /></li>
 *			<li><img src="images/05.jpg" alt="" /></li>
 *		</ul>
 *	</div>
 *
 */

(function($) {

	$.fn.projectSlider = function(options){
	  
		// default configuration properties
		var defaults = {
			prevElem: 		{},
			nextElem: 		{},	
			speed: 			800			
		}; 
		
		var options = $.extend(defaults, options);  
		
		return this.each(function() {
			$("li", obj).each(function(){
				$(this).show();
			});
			var obj = $(this);
			var s = $("li", obj).length;
			var w = 155; 
			var h = 155*2; 
			// es sollen 10 elemente angezeigt werden
			var ts = (s/10)-1;
			var t = 0;
			$("ul", obj).css('width',(w*5) + 'px');
			$("ul", obj).css('height',(h) + 'px');
			//$(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>');		
			$(options.prevElem).parent().css('display','block');
			$(options.prevElem).css('visibility','hidden');
			$(options.nextElem).click(function(){
				t = (t>=ts) ? ts : t+1;	
				projectSliderRefreshDisplay('down');
				if (t>=ts) $(this).css('visibility','hidden');
				$(options.prevElem).css('visibility','');
				return false;
			});
			$(options.prevElem).click(function(){
				t = (t<=0) ? 0 : t-1;
				projectSliderRefreshDisplay('up');
				if (t<=0) $(this).css('visibility','hidden');
				$(options.nextElem).css('visibility','');
				return false;
			});
			if(ts>0)	$(options.nextElem).css('visibility','');
			else		$(options.nextElem).css('visibility','hidden');
			function projectSliderRefreshDisplay(dir){
				var p = (t*h*-1);
				$(obj).animate(
					{ marginTop: p+'px' }, 
					options.speed
				);					
			}
		});
	};

})(jQuery);