$(function() {
        //scrollpane parts
        var scrollPane = $('.scroll-pane');
        var scrollContent = $('.scroll-content');
        
        //build slider
        var scrollbar = $(".scroll-bar").slider({
                slide:function(e, ui){
                        if( scrollContent.width() > scrollPane.width() ){ scrollContent.css('margin-left', Math.round( ui.value / 100 * ( scrollPane.width() - scrollContent.width() )) + 'px'); }
                        else { scrollContent.css('margin-left', 0); }
                }
        });
        
        //append icon to handle
        var handleHelper = scrollbar.find('.ui-slider-handle')
        .mousedown(function(){
                scrollbar.width( handleHelper.width() );
        })
        .mouseup(function(){
                scrollbar.width( '100%' );
        })
        .append('<span class="ui-icon ui-icon-grip-dotted-vertical"></span>')
        .wrap('<div class="ui-handle-helper-parent"></div>').parent();
        
        //change overflow to hidden now that slider handles the scrolling
        scrollPane.css('overflow','hidden');
        
        //size scrollbar and handle proportionally to scroll distance
        function sizeScrollbar(){
                var remainder = scrollContent.width() - scrollPane.width();
                var proportion = remainder / scrollContent.width();
                var handleSize = scrollPane.width() - (proportion * scrollPane.width());
                scrollbar.find('.ui-slider-handle').css({
                        width: handleSize,
                        'margin-left': -handleSize/2
                });
                handleHelper.width('').width( scrollbar.width() - handleSize);
        }
        
        //reset slider value based on scroll content position
        function resetValue(){
                var remainder = scrollPane.width() - scrollContent.width();
                var leftVal = scrollContent.css('margin-left') == 'auto' ? 0 : parseInt(scrollContent.css('margin-left'));
                var percentage = Math.round(leftVal / remainder * 100);
                scrollbar.slider("value", percentage);
        }
        //if the slider is 100% and window gets larger, reveal content
        function reflowContent(){
                        var showing = scrollContent.width() + parseInt( scrollContent.css('margin-left') );
                        var gap = scrollPane.width() - showing;
                        if(gap > 0){
                                scrollContent.css('margin-left', parseInt( scrollContent.css('margin-left') ) + gap);
                        }
        }
        
        //change handle position on window resize
        $(window)
        .resize(function(){
                        resetValue();
                        sizeScrollbar();
                        reflowContent();
        });
        //init scrollbar size
        setTimeout(sizeScrollbar,10);//safari wants a timeout
});