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JavaScript

//jQuery vertical scroller plugin v1.6
//Author: Simon Battersby, www.simonbattersby.com 
//Documentation: http://www.simonbattersby.com/blog/vertical-scrollbar-plugin-using-jquery-ui-slider/


(function( $ ){

  $.fn.sbscroller = function( options ) {  

    var settings = {//defaults
    handleImage : false,
    handleTopImage : false,
    handleBottomImage : false,
    handleGripImage : false,
    mousewheel : false,
    autohide : false
    };
    
    return this.each(function() { 
      if (options === 'refresh') {
         $.extend( settings, $(this).data() );//include any previously stored options for this scroll pane
         if (!$(this).hasClass('scroll-pane')){//traps the case where refresh has been called on slider that has not been set up
              $(this).addClass('scroll-pane').data(options);//add a class and store the options as data against the element in case they are needed later
              $(this).children().wrapAll('<div class="scroll-content"/>');
         }
         setSlider($(this));
      }
    
      else {
          if ( options ) { 
            $.extend( settings, options );
          }
          $(this).addClass('scroll-pane').data(options);//add a class and store the options as data against the element in case they are needed later
          $(this).children().wrapAll('<div class="scroll-content"/>');
          setSlider($(this));
      }
      
    });
    
    function setSlider($scrollpane){
        
        //change the main div to overflow-hidden as we can use the slider now
        $scrollpane.css('overflow','hidden');
        
        //compare the height of the scroll content to the scroll pane to see if we need a scrollbar
        var difference = $scrollpane.find('.scroll-content').height()-$scrollpane.height();//eg it's 200px longer
        $scrollpane.data('difference',difference); 
        
        if(difference<=0 && $scrollpane.find('.slider-wrap').length>0)//scrollbar exists but is no longer required
        ...