diff --git a/examples/04_load_and_save.html b/examples/04_load_and_save.html
index 7614fe7..d8be3c9 100644
--- a/examples/04_load_and_save.html
+++ b/examples/04_load_and_save.html
@@ -52,8 +52,21 @@
 
   // Save a JSON document
   document.getElementById('saveDocument').onclick = function () {
+    // Save Dialog
+    fname = window.prompt("Save as...");
+    
+    // Check json extension in file name
+    if(fname.indexOf(".")==-1){
+      fname = fname + ".json";
+    }else{
+      if(fname.split('.').pop().toLowerCase() == "json"){
+        // Nothing to do
+      }else{
+        fname = fname.split('.')[0] + ".json";
+      }
+    } 
     var blob = new Blob([editor.getText()], {type: 'application/json;charset=utf-8'});
-    saveAs(blob, 'document.json');
+    saveAs(blob, fname);
   };
 </script>
 </body>