Fixes in metadata dialogs

This includes:

* workaround for mask not appearing in add dialog
* reset of metadata list on lcosing the edit dialog

Refs #375

ui/static/main.css

@@ -1163,7 +1163,6 @@ input.machine {
 .meta-modal button {
     font-size: 80%;
     width: 87px;
-
     float: right;
     background-color: #5599FF;
     border: 0px solid #5599FF;

ui/templates/machines.html

@@ -593,7 +593,15 @@ function editMetadata() {
         top: '10%',
         closeOnClick: false,
         oneInstance: false,
-        load: false
+        load: false,
+        onClose: function() {
+            // remove all entries so they won't be preloaded next time you open the dialog
+            $("#editor-1 div.content ul.meta-list").empty();
+        },
+        onLoad: function() {
+            // this is a work around for the mask not appearing problem
+            $("#editor-1").expose();
+        }
     });
     // get metadata for current server and fill the dialog
     serverID = $("#editor-1 h3").attr('id');
@@ -611,7 +619,11 @@ function addMetadata() {
         top: '10%',
         closeOnClick: false,
         oneInstance: false,
-        load: false
+        load: false,
+        onLoad: function() {
+            // this is a work around for the mask not appearing problem
+            $("#editor-2").expose();
+        }
     });
     $("a#meta-editor-2").data('overlay').load();
     return false;