diff --git a/js/tbl_change.js b/js/tbl_change.js
index c7bee73e8433..97c9bf7663c3 100644
--- a/js/tbl_change.js
+++ b/js/tbl_change.js
@@ -9,8 +9,9 @@
  * Modify from controls when the "NULL" checkbox is selected
  *
  * @param   string   the MySQL field type
- * @param   string   the urlencoded field name
+ * @param   string   the urlencoded field name - OBSOLETE 
  * @param   string   the md5 hashed field name
+ * @param   string   the multi_edit row sequence number
  *
  * @return  boolean  always true
  */
@@ -18,8 +19,8 @@ function nullify(theType, urlField, md5Field, multi_edit)
 {
     var rowForm = document.forms['insertForm'];
 
-    if (typeof(rowForm.elements['funcs' + multi_edit + '[' + urlField + ']']) != 'undefined') {
-        rowForm.elements['funcs' + multi_edit + '[' + urlField + ']'].selectedIndex = -1;
+    if (typeof(rowForm.elements['funcs' + multi_edit + '[' + md5Field + ']']) != 'undefined') {
+        rowForm.elements['funcs' + multi_edit + '[' + md5Field + ']'].selectedIndex = -1;
     }
 
     // "SET" field , "ENUM" field with more than 20 characters
@@ -47,7 +48,7 @@ function nullify(theType, urlField, md5Field, multi_edit)
     }
     // Other field types
     else /*if (theType == 5)*/ {
-        rowForm.elements['fields' + multi_edit + '[' + urlField + ']'].value = '';
+        rowForm.elements['fields' + multi_edit + '[' + md5Field + ']'].value = '';
     } // end if... else if... else
 
     return true;
@@ -59,6 +60,7 @@ function nullify(theType, urlField, md5Field, multi_edit)
  * entered
  *
  * @param   string   the urlencoded field name
+ * @param   string   the multi_edit row sequence number
  *
  * @return  boolean  always true
  */