diff --git a/public/dragreg.js b/public/dragreg.js
index 70b44c7..e42229c 100644
--- a/public/dragreg.js
+++ b/public/dragreg.js
@@ -47,6 +47,9 @@ function key_handler(e) {
     case 27: /* Escape */
       hide_add_dialog();
       break;
+    case 187: /* Plus */
+      show_add_dialog();
+      break;
   }
 }
 
@@ -54,14 +57,18 @@ function key_handler(e) {
 
 // Shows the upload/add dialog.
 function show_add_dialog() {
-  $('text').clear();
-  $('add_dialog').appear({duration: 0.25});
+  if (!$('add_dialog').visible()) {
+    $('text').clear();
+    $('add_dialog').appear({duration: 0.25});
+  }
 }
 
 // Hides and clears the upload/add dialog.
 function hide_add_dialog() {
-  $('add_dialog').fade({duration: 0.25});
-  $('add_form').reset();
+  if ($('add_dialog').visible()) {
+    $('add_dialog').fade({duration: 0.25});
+    $('add_form').reset();
+  }
 }
 
 // Returns a Z-index higher with respect to the Z-index of all existing