+    var $sidebar = $('.sidebar:eq(0)');

+    var sidebarPos = false;

+    function resizeScreen() {

+        if ( $sidebar.length ) {

+            sidebarPos = {

+                top:$sidebar.offset().top - 60,

+                bottom:$sidebar.offset().top + $sidebar.find('.sidebar-content').height() - $(window).height() + 20,

+                width:$sidebar.width(),

+                footer:$('#footer').offset().top - $(window).height(),

+            }

+            $('.sidebar-content').css('width',$sidebar.width());

+        }

+    }

+    $(window).on('resize',resizeScreen);

+    resizeScreen();

+

+    var scrollPos;

+    function scrollScreen() {

+        if ( sidebarPos ) {

+            scrollPos = $(window).scrollTop();

+            if ( scrollPos > sidebarPos.top ) {

+                $sidebar.addClass('fixed-for-top');

+                if ( scrollPos > sidebarPos.bottom ) {

+                    $sidebar.addClass('fixed-for-bottom');

+                    if ( scrollPos > sidebarPos.footer ) {

+                        $sidebar.addClass('fixed-on-footer');

+                    } else {

+                        $sidebar.removeClass('fixed-on-footer');

+                    }

+                } else {

+                    $sidebar.removeClass('fixed-for-bottom');

+                }

+            } else {

+                $sidebar.removeClass('fixed-for-top');

+            }

+        }

+    }

+    $(window).on('scroll', scrollScreen);

+    scrollScreen();

+  position:relative;

+}

+.sidebar.fixed-for-bottom .sidebar-content {

+    position: fixed;

+    bottom: 0;

+}

+.sidebar.fixed-on-footer .sidebar-content{

+    position:absolute;