diff --git a/ChangeLog b/ChangeLog
index 12e1d24ae..bf9925981 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -92,6 +92,7 @@ $Id$
   is no progress bar possible
 - bug [replication] Do not offer information_schema in the list of databases
 - bug [js] Avoid loading twice a js file
+- bug #3024344 [setup] Setup forces numeric MemoryLimit
 
 3.3.4.0 (2010-06-28)
 - bug #2996161 [import] properly escape import value
diff --git a/Documentation.html b/Documentation.html
index d414b477b..7e945dba2 100644
--- a/Documentation.html
+++ b/Documentation.html
@@ -1315,7 +1315,7 @@ CREATE DATABASE,ALTER DATABASE,DROP DATABASE</pre>
     <dd>Path for storing session data (<a
     href="http://php.net/session_save_path">session_save_path PHP parameter</a>).</dd>
 
-    <dt id="cfg_MemoryLimit">$cfg['MemoryLimit'] integer [number of bytes]</dt>
+    <dt id="cfg_MemoryLimit">$cfg['MemoryLimit'] string [number of bytes]</dt>
     <dd>Set the number of bytes a script is allowed to allocate. If set
         to zero, no limit is imposed.<br />
         This setting is used while importing/exporting dump files and at some
diff --git a/js/common.js b/js/common.js
index 1d52c9770..8ba7bcd0f 100644
--- a/js/common.js
+++ b/js/common.js
@@ -101,10 +101,13 @@ function setDb(new_db) {
         var old_db = db;
         db = new_db;
 
+        // the db name as an id exists only when LeftFrameLight is false
         if (window.frame_navigation.document.getElementById(db) == null) {
+            // happens when LeftFrameLight is true
             // db is unknown, reload complete left frame
             refreshNavigation();
         } else {
+            // happens when LeftFrameLight is false
             unmarkDbTable(old_db);
             markDbTable(db);
         }
diff --git a/libraries/config.default.php b/libraries/config.default.php
index b2a393275..be034c8cb 100644
--- a/libraries/config.default.php
+++ b/libraries/config.default.php
@@ -542,11 +542,13 @@ $cfg['ExecTimeLimit'] = 300;
 $cfg['SessionSavePath'] = '';
 
 /**
- * maximum allocated bytes (0 for no limit)
+ * maximum allocated bytes ('0' for no limit)
+ * this is a string because '16M' is a valid value; we must put here
+ * a string as the default value so that /setup accepts strings 
  *
- * @global integer $cfg['MemoryLimit']
+ * @global string $cfg['MemoryLimit']
  */
-$cfg['MemoryLimit'] = 0;
+$cfg['MemoryLimit'] = '0';
 
 /**
  * mark used tables, make possible to show locked tables (since MySQL 3.23.30)