Merge pull request BonsaiDen#196 from sweaf/master

fixed thrown TypeErrors on mac, while scrolling over the top edge

Author: timruffles

site/javascript/garden.js

@@ -33,7 +33,7 @@ Sections.prototype = {
             articleID = this.names[this.names.length - 1].id;
 
         for(var i = 0, l = this.names.length; i < l; i++) {
-            if (this.names[i].offset > scroll) {
+            if (scroll > 0 && this.names[i].offset > scroll) {
                 articleID = this.names[i - 1].id;
                 break;
             }