function disable_on_submit(elements_string) {
   var elements = elements_string.split(",");
   for (var i = 0; i < elements.length; i++) {
      var elements_with_same_name = document.getElementsByName(elements[i]);
      for (var j = 0; j < elements_with_same_name.length; j++) {
         var element = elements_with_same_name[j];
         element.disabled = true;
         if (element.type == "submit") {
            element.value = "please wait";
         }
      }
   }
}