1 files changed, 11 insertions, 1 deletions
diff --git a/js/app.js b/js/app.js
index e0b737d..5898f5c 100644
--- a/js/app.js
+++ b/js/app.js
@@ -6,6 +6,8 @@ var selecting = false
 var filling = false
 var changed = false
 var transforming = false
+var mirror_x = false
+var mirror_y = false
 var focused
 
 var canvas, tools, palette, controls, brush, mode 
@@ -80,7 +82,15 @@ function bind () {
   })
   
   window.onbeforeunload = function() {
-    if (changed) return "You have edited this drawing."
+    if (changed && !in_iframe()) return "You have edited this drawing."
+  }
+
+  function in_iframe () {
+    try {
+      return window.self !== window.top;
+    } catch (e) {
+      return true;
+    }
   }
 }