(function($) {
  $.fn.easySlider = function(options){
    var defaults = {      
      prevId:     'prevBtn',
      nextId:     'nextBtn',  
      firstId:    'firstBtn',
      lastId:     'lastBtn',  
      vertical:   false,
      speed:      800,
      auto:     false,
      pause:      2000,
      continuous:   false,
      goToButtonId:   'goToButton',
      goToRotateAmount:8,
      effect: 'Slide',
      navigation_type: 'Navigation Buttons',
      fadeNavigation:  false
    }; 
    
    var options = $.extend(defaults, options);  
        
    this.each(function() {  
      var obj = $(this); 
      var container = obj.parent();
      var slide = $("li.slide", container);
      var s = slide.length;
      var w = slide.width(); 
      var h = slide.height(); 
      var timeout;
      var timer_activated = options.auto; 
      obj.css("overflow","hidden");
      var ts = s-1;
      var t = 0;
      
      $("ul.slider-list", container).css('width',s*w);      
      if(!options.vertical){ $("li.slide", container).css('float','left'); }
      
      //Navigation...
      if(options.navigation_type != "No Buttons"){
        var html = '';
        if(options.navigation_type == "Navigation Buttons"){
          html += "<div id='easySlider-goToButtons'>";
          html += ' <span id="leftb"><a class="leftright" href=\"javascript:void(0);\">&nbsp</a></span>';
          for(var i=0; i < ts+1; i++){ 
            html += "<a id=\"" + options.goToButtonId + i + "\" href=\"javascript:void(0);\">" + (i+1) + "</a> ";
          }
          html += ' <span id="rightb"><a class="leftright" href=\"javascript:void(0);\">&nbsp</a></span>';
          html += '<div id="pauseplay"></div>';
          html += "</div>";
        }
        if(options.navigation_type == "Big Arrows"){
          html += ' <span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">&nbsp</a></span>';
          html += ' <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">&nbsp</a></span>';
        }else if(options.navigation_type == "Small Arrows"){
          html += "<div id='smallButtons'>";
          html += ' <span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">&nbsp</a></span>';
          html += ' <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">&nbsp</a></span>';
          html += "</div>";
        }
        $(obj).after(html);                   
      };
      //end nav
          
      $("a","#"+options.nextId, container).click(function(){    
        animate("next",true, container);
      });
      $("a","#"+options.prevId, container).click(function(){    
        animate("prev",true, container);       
      }); 
      $("span#leftb a", container).click(function(){    
        animate("prev",true, container);       
      });
      $("span#rightb a", container).click(function(){   
        animate("next",true, container);       
      });
      $("a","#"+options.firstId, container).click(function(){   
        animate("first",true, container);
      });       
      $("a","#"+options.lastId, container).click(function(){    
        animate("last",true, container);       
      }); 
      $("div#easySlider-goToButtons a:not(.leftright)", container).click(function(){
        animate(parseInt($(this).attr('id').substring(options.goToButtonId.length)), true, container);
      });
      
      if(options.navigation_type == "Navigation Buttons"){
        $("#" + options.goToButtonId + "0", container).addClass('active');
      }
      
      function update_goToButtons(btns){
        if(btns.size() > options.goToRotateAmount){
          var min = Math.max(t - Math.floor(options.goToRotateAmount/2), 0);
          var max = Math.min(t + Math.floor(options.goToRotateAmount/2), btns.size());
          var diff = max - min;
          if(diff != options.goToRotateAmount){
            min = Math.max(min - (options.goToRotateAmount - diff), 0);
          }
          diff = max - min;
          if(diff != options.goToRotateAmount){
            max = Math.min(max + (options.goToRotateAmount - diff), btns.size());
          }
          for(var i = 0; i < min; i++){
            $("#" + options.goToButtonId + i, container).hide();
          }
          for(var i = min; i < max; i++){
            $("#" + options.goToButtonId + i, container).show();
          }
          for(var i = max; i < btns.size(); i++){
            $("#" + options.goToButtonId + i, container).hide();
          }
        }
      }
      
      update_goToButtons($("div#easySlider-goToButtons a:not(.leftright)", container));
      
      function animate(dir, clicked, container){
        var ot = t;       
        switch(dir){
          case "next":
            t = (ot>=ts) ? (options.continuous ? 0 : ts) : t+1;           
            break; 
          case "prev":
            t = (t<=0) ? (options.continuous ? ts : 0) : t-1;
            break; 
          case "first":
            t = 0;
            break; 
          case "last":
            t = ts;
            break; 
          default:
            if(typeof(dir) == "number"){
              t = dir;
            }
            break; 
        };  
        
        if(options.navigation_type == "Navigation Buttons"){
          var btns = $("div#easySlider-goToButtons a:not(.leftright)", container);
          btns.removeClass("active");
          $("#" + options.goToButtonId + t, container).addClass('active');
          update_goToButtons(btns);
        }
        
        var diff = Math.abs(ot-t);
        //var speed = diff*options.speed; //don't like this... too slow for lots of slides
        var position = (t*w*-1);
        if(options.vertical){
          position = (t*h*-1);
        }
        
        if(diff != 0){//Only run it if it's moving to another slide.
          if(options.effect == "Slide"){
            var speed = (diff*options.speed)/diff;
            if(!options.vertical) {
              $("ul.slider-list",container).animate({ 
                  marginLeft: position
              }, speed);        
            } else {
              p = (t*h*-1);
              $("ul.slider-list",container).animate({ 
                marginTop: position 
              }, speed);          
            };
          }else if(options.effect == "Fade"){
            var margin = "marginLeft";
            if(options.vertical){ 
              margin = "marginTop"; 
            }

            $("ul.slider-list", container).fadeOut(Math.ceil(options.speed/2), function(){
              $(this).css(margin, position).fadeIn(Math.ceil(options.speed/2));
            });
          }
        }
        
        if(!options.continuous){          
          if(t==ts){
            $("a","#"+options.nextId, container).hide();
            $("a","#"+options.lastId, container).hide();
          } else {
            $("a","#"+options.nextId, container).show();
            $("a","#"+options.lastId, container).show();          
          };
          if(t==0){
            $("a","#"+options.prevId, container).hide();
            $("a","#"+options.firstId, container).hide();
          } else {
            $("a","#"+options.prevId, container).show();
            $("a","#"+options.firstId, container).show();
          };          
        };        
        
        if(clicked){ 
          clear_timer(); 
        }
        if(timer_activated && dir=="next" && !clicked){
          set_timer(diff*options.speed+options.pause);
        };
      };
      
      function set_timer(duration){
        timeout = setTimeout(function(){
          animate("next",false, container);
        }, duration);
        timer_activated = true;
        $('div#pauseplay', container).addClass('pause').removeClass('play');
      }
      
      function clear_timer(){
        clearTimeout(timeout);
        timer_activated = false;
        $('div#pauseplay', container).addClass('play').removeClass('pause');
      }

      if(options.fadeNavigation){
        var selector = "div#smallButtons,div#easySlider-goToButtons,#" + options.prevId + ",#" + options.nextId;
        container.hover(function(){
          $(selector, container).fadeIn('fast');
        }, function(){
          $(selector, container).fadeOut();
        });
      }

      $('div#pauseplay', container).click(function(){
        if(timer_activated){
          clear_timer();
        }else{
          set_timer(options.pause);
        }
      });
          
      // init
      if(timer_activated){
        set_timer(options.pause);
        $('div#pauseplay', container).addClass('pause');
      }else{
        $('div#pauseplay', container).addClass('play');
      }
      
      if(!options.continuous){          
        $("a","#"+options.prevId, container).hide();
        $("a","#"+options.firstId, container).hide();       
      }
    });
  }
})(jQuery);