--- cacti-0.8.6b/user_admin.php	2004-11-29 20:25:47.639776040 -0600
+++ cacti-0.8.6b-new/user_admin.php	2004-11-29 21:10:28.811176032 -0600
@@ -119,6 +119,11 @@
 			$password = md5($_POST["password"]);
 		}
 
+		/* check duplicate username */
+		if (sizeof(db_fetch_row("select * from user_auth where realm = 0 and username = '" . $_POST["username"] . "' and id != '" . $_POST["id"] . "'"))) {
+			raise_message(12);	
+		}
+
 		/* check to make sure the passwords match; if not error */
 		if ($_POST["password"] != $_POST["password_confirm"]) {
 			raise_message(4);
--- cacti-0.8.6b/include/config_arrays.php	2004-11-29 20:45:31.621783416 -0600
+++ cacti-0.8.6b-new/include/config_arrays.php	2004-11-29 20:26:15.657516696 -0600
@@ -46,6 +46,9 @@
 	7  => array(
 		"message" => 'XML parse error.',
 		"type" => "error"),
+	12 => array(
+		"message" => 'Username already in use.',
+		"type" => "error"),
 	15 => array(
 		"message" => 'XML: Cacti version does not exist.',
 		"type" => "error"),