diff --git a/course/teacher.php b/course/teacher.php
index 6e5656481f0..7fe180fe8ae 100644
--- a/course/teacher.php
+++ b/course/teacher.php
@@ -13,7 +13,7 @@
     require_login();
 
     if (!iscreator()) {
-        error("You must be an administrator or teacher to use this page.");
+        error("You must be an administrator or course creator to use this page.");
     }
 
     $strassignteachers = get_string("assignteachers");
@@ -40,7 +40,7 @@
 		print_simple_box_start("CENTER");
         
 		foreach ($courses as $course) {
-		    if ($isadmin OR ismainteacher($course->id, $USER->id)){
+		    if ($isadmin OR isteacher($course->id, $USER->id)){
 			    echo "<A HREF=\"teacher.php?id=$course->id\">$course->fullname</A><BR>\n";
 				$coursesfound = TRUE;
 			}
@@ -76,7 +76,7 @@
 /// Add a teacher if one is specified
 
     if (!empty($add)) {
-	    if (!ismainteacher($course->id, $USER->id)){
+	    if (!isteacher($course->id, $USER->id)){
 		    error("You must be an administrator or teacher to modify this course.");
         }
 
@@ -110,7 +110,7 @@
 
     if (!empty($remove)) {
 
-        if (!ismainteacher($course->id, $USER->id)){
+        if (!isteacher($course->id, $USER->id)){
         	error("You must be an administrator or teacher to modify this course.");
 		}
         if (! $user = get_record("user", "id", $remove)) {
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 8c6d33158f7..befe23378f8 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -418,24 +418,6 @@ function iscreator ($userid=0) {
     return record_exists("user_coursecreators", "userid", $userid);
 }
 
-function ismainteacher ($courseid, $userid=0){
-/// Is user the main teacher of course
-    global $USER;
-
-    if (isadmin($userid)) {  // admins can do anything the teacher can
-        return true;
-    }
-
-	if (empty($userid)) {
-        if (empty($USER->id)) {
-            return false;
-        }
-        $userid = $USER->id;
-    }
-    
-    return record_exists("user_teachers", "userid", $userid, "course", $courseid, "authority", "1");
-}
-
 function isstudent($courseid, $userid=0) {
 /// Is the user a student in this course?
     global $USER;