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+/* jSticky Plugin
+ * =============
+ * Author: Andrew Henderson (@AndrewHenderson)
+ * Contributor: Mike Street (@mikestreety)
+ * Date: 9/7/2012
+ * Update: 09/20/2016
+ * Website: http://github.com/andrewhenderson/jsticky/
+ * Description: A jQuery plugin that keeps select DOM
+ * element(s) in view while scrolling the page.
+ */
+
+// Modifications to compensate for WordPress admin bar height, wp-admin .wrap class top margin and plugin page's margin top is done by Bowo (https://bowo.io)
+(function($) {
+
+  $.fn.sticky = function(options) {
+    var defaults = {
+      topSpacing: 0, // No spacing by default
+      zIndex: '', // No default z-index
+      stopper: '.sticky-stopper', // Default stopper class, also accepts number value
+      stickyClass: false // Class applied to element when it's stuck
+    };
+    var settings = $.extend({}, defaults, options); // Accepts custom stopper id or class
+
+    // Checks if custom z-index was defined
+    function checkIndex() {
+      if (typeof settings.zIndex == 'number') {
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    var hasIndex = checkIndex(); // True or false
+
+    // Checks if a stopper exists in the DOM or number defined
+    function checkStopper() {
+      if (0 < $(settings.stopper).length || typeof settings.stopper === 'number') {
+        return true;
+      } else {
+        return false;
+      }
+    }
+    var hasStopper = checkStopper(); // True or false
+
+    return this.each(function() {
+
+      var $this = $(this);
+      var adminBarHeight = 32; // height of WP admin bar
+      // var adminBarOffset = 8;
+      var adminBarOffset = 0;
+      var adminWrapOffset = 0; // margin-top of wp-admin .wrap
+      // var headerMarginTop = 24;
+      var headerMarginTop = 0;
+      var thisHeight = $this.outerHeight();
+      var thisWidth = $this.outerWidth();
+      var topSpacing = settings.topSpacing;
+      var zIndex = settings.zIndex;
+      var pushPoint = $this.offset().top - topSpacing - adminBarHeight; // Point at which the sticky element starts pushing
+      var placeholder = $('<div></div>').width(thisWidth).height(thisHeight).css('margin-top',headerMarginTop+'px').addClass('sticky-placeholder'); // Cache a clone sticky element
+      var stopper = settings.stopper;
+      var $window = $(window);
+
+      function stickyScroll() {
+
+        var windowTop  = $window.scrollTop(); // Check window's scroll position
+        var stopPoint = stopper;
+        var parentWidth = $this.parent().width();
+
+        placeholder.width(parentWidth)
+
+        if ( hasStopper && typeof stopper === 'string' ) {
+          var stopperTop = $(stopper).offset().top;
+          stopPoint  = (stopperTop - thisHeight) - topSpacing;
+        }
+
+        // console.log( 'thisHeight: ' + thisHeight + ' | thisWidth: ' + thisWidth + ' | pushPoint: ' + pushPoint + ' | windowTop: ' + windowTop + ' | stopPoint: ' + stopPoint  );
+
+        if (pushPoint < windowTop) {
+          // Create a placeholder for sticky element to occupy vertical real estate
+          if(settings.stickyClass)
+            $this.addClass(settings.stickyClass,0);
+
+          $this.after(placeholder).css({
+            position: 'fixed',
+            top: topSpacing + adminBarOffset,
+            width: parentWidth
+          });
+
+          if (hasIndex) {
+            $this.css({
+              zIndex: zIndex
+            });
+          }
+
+          if (hasStopper) {
+            if (stopPoint < windowTop) {
+              var diff = (stopPoint - windowTop) + topSpacing + adminBarOffset;
+              $this.css({
+                top: diff
+              });
+            }
+          }
+        } else {
+          if(settings.stickyClass)
+            $this.removeClass(settings.stickyClass);
+
+          $this.css({
+            position: 'static',
+            top: null,
+            left: null,
+            width: 'auto'
+          });
+
+          placeholder.remove();
+        }
+      }
+
+      if($window.innerHeight() > thisHeight) {
+
+        $window.bind('scroll', stickyScroll);
+        $window.bind('load', stickyScroll);
+        $window.bind('resize', stickyScroll);
+      }
+    });
+  };
+})(jQuery);