move js files from js/pandora to js, fixes #1366

static/js/backButton.js

@@ -0,0 +1,28 @@
+// vim: et:ts=4:sw=4:sts=4:ft=javascript
+'use strict';
+pandora.ui.backButton = function() {
+    var that = Ox.Button({
+        title: Ox._('Back to {0}', [Ox._(pandora.site.itemName.plural)]),
+        width: 96
+    }).css({
+        float: 'left',
+        margin: '4px 0 0 4px'
+    })
+    .bindEvent({
+        click: function() {
+            /*
+            FIXME: if, on page load, one clicks back quickly,
+            the item content may overwrite the list content.
+            but we cannot cancel all requests, since that
+            might keep the lists folders from loading.
+            so we'd have to cancel with a function -- and
+            it's unclear if the best place for that is here
+            */
+            if (['accessed', 'timesaccessed'].indexOf(pandora.user.ui.listSort[0].key) > -1) {
+                Ox.Request.clearCache('find');
+            }
+            pandora.UI.set({item: ''});
+        }
+    });
+    return that;
+};