diff --git a/form.php b/form.php
index 468ab00..a74ddce 100644
--- a/form.php
+++ b/form.php
@@ -838,6 +838,16 @@ class formfield
     $res .= " class='form-control btn-primary'";
     if (isset ($this->hidden) && $this->hidden !== FALSE)
       $res .= " style='display:none'";
+    // Block the submit button 10s. The user can not double click on it and
+    // submit two times the POST to the server
+    // Re-enable after 15s, if there is a problem with the server
+    // This code is needed by Chrome and Edge which allow multiple submission of
+    // a form
+    $res .= " onclick='submit=this ; ";
+    $res .= "submit.setAttribute(\"disabled\", \"disabled\");";
+    $res .= " setTimeout(function() {";
+    $res .= "   submit.removeAttribute(\"disabled\"); }, 15000);";
+    $res .= "'";
     $res .= "/>\n";
     $res .= "    </div>\n";
     $res .= "  </div>\n";