(function($) {

	$.fn.easySlider = function(options){

		// default configuration properties
		var defaults = {
			prevId: 		'prevBtn',
			prevText: 		'Previous',
			nextId: 		'nextBtn',
			nextText: 		'Next',
			orientation:	'', //  'vertical' is optional;
			speed: 			800,
      itemPerSlide : 4
		};

		var options = $.extend(defaults, options);

		return this.each(function() {
			obj = $(this);
			var s = $("li", obj).length;
			var w = obj.width();
			var h = obj.height();
      var itemWidth = parseInt(w/options.itemPerSlide);
			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');
      if( s > options.itemPerSlide ) {
        $(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();
			$("a","#"+options.nextId).hide();
      //if( s > options.itemPerPage ) {
        $("a","#"+options.nextId).click(function(){
          //animate("next");
          t = t+1;
          p = parseInt($("ul",obj).css("margin-left"));
          $("ul",obj).animate(
            { marginLeft: p-itemWidth },
            options.speed
          );
          if (t>=ts) $(this).fadeOut();
          $("a","#"+options.prevId).fadeIn();
        });
        $("a","#"+options.prevId).click(function(){
          //animate("prev");
          t = t-1;
          p = parseInt($("ul",obj).css("margin-left"));
          $("ul",obj).animate(
            { marginLeft: p+itemWidth },
            options.speed
          );
          if (t<=0) $(this).fadeOut();
          $("a","#"+options.nextId).fadeIn();
        });
      //}
      if(s>1) $("a","#"+options.nextId).fadeIn();
    });

	};

})(jQuery);