/* Copyright (c) 2009 Brandon Aaron (http://brandonaaron.net)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
 *
 * Version: 3.0.2
 * 
 * Requires: 1.2.2+
 */
(function(c){var a=["DOMMouseScroll","mousewheel"];c.event.special.mousewheel={setup:function(){if(this.addEventListener){for(var d=a.length;d;){this.addEventListener(a[--d],b,false)}}else{this.onmousewheel=b}},teardown:function(){if(this.removeEventListener){for(var d=a.length;d;){this.removeEventListener(a[--d],b,false)}}else{this.onmousewheel=null}}};c.fn.extend({mousewheel:function(d){return d?this.bind("mousewheel",d):this.trigger("mousewheel")},unmousewheel:function(d){return this.unbind("mousewheel",d)}});function b(f){var d=[].slice.call(arguments,1),g=0,e=true;f=c.event.fix(f||window.event);f.type="mousewheel";if(f.wheelDelta){g=f.wheelDelta/120}if(f.detail){g=-f.detail/3}d.unshift(f,g);return c.event.handle.apply(this,d)}})(jQuery);

    function MakeScrollable ( frame, up, down )
    {
    
    
      var element = $(frame);  
      var snap = 20;
      
      function ScrollDown ()
      {
      
        if( element.is(':animated') )
          return;
          
        var step = element.height() / 2;
        var top = element.attr('scrollTop');  
        var maxScroll = element.attr("scrollHeight") - element.innerHeight( );                      
        
        var newtop = top + step;
        if ( newtop > maxScroll - snap ) newtop = maxScroll;
        
        if ( newtop != top )
          element.animate({scrollTop: newtop }, 1000);  

      }
      
      function ScrollUp ()
      {
          if( element.is(':animated') )
            return;
        
          var step = element.height() / 2;
          var top = element.attr('scrollTop');  
          var newtop = top - step;
          if ( newtop < snap ) newtop = 0;       
          if ( newtop != top )
            element.animate({scrollTop: newtop }, 1000);  
      }
      
      
      $(frame).mousewheel( function ( event, delta ) {
        if ( delta < 0 )
          ScrollDown();
        else
          ScrollUp();  
        
      } );
      
      $(down).click ( function () {  
        return ScrollDown();
      });

      $(up).click ( function () {  
        return ScrollUp();
      });
    
    }