Index: class.t3lib_div.php
===================================================================
--- class.t3lib_div.php	(révision 3517)
+++ class.t3lib_div.php	(copie de travail)
@@ -4242,14 +4242,9 @@
 	 * @return	object		A reference to the object
 	 */
 	public static function &makeInstance($className)	{
+		// Load class file if not found:
+		t3lib_div::dynClassLoad($className);
 
-			// Load class file if not found:
-		if (!class_exists($className))	{
-			if (substr($className,0,6)=='t3lib_')	{
-				t3lib_div::requireOnce(PATH_t3lib.'class.'.strtolower($className).'.php');
-			}
-		}
-
 			// Get final classname
 		$className =  t3lib_div::makeInstanceClassName($className);
 
@@ -4257,7 +4252,45 @@
 		return new $className;
 	}
 
+
 	/**
+	 * Dynamic class load : native suppor of t3lib / tslib classes, other classes have to be declared into 
+	 * $TYPO3_CONF_VARS['CLASS_REGISTER'] ( $TYPO3_CONF_VARS['CLASS_REGISTER'][<classname>] = <pathToFile> )
+	 * 
+	 * @param string $className = the class to load
+	 * @access static
+	 * @return bool = true if class exists after processing
+	 */
+	function dynClassLoad($className) {
+		/* Declare */
+		global $TYPO3_CONF_VARS;
+		$fileName = null;
+
+		/* Begin */
+		if (class_exists($className)) {
+			// Nothing to do
+			return true;
+		} elseif (substr($className, 0, 6) == 't3lib_') {
+			// t3lib classes
+			$fileName = PATH_t3lib . 'class.' . $className . '.php';
+
+		} elseif (substr($className, 0, 6) == 'tslib_') {
+			// tslib classes
+			$fileName = t3lib_extMgm::extPath('cms', 'tslib/' . 'class.' . $className . '.php');
+
+		} elseif (isset($TYPO3_CONF_VARS['CLASS_REGISTER'][$className])) {
+			// Other classes
+			$fileName = t3lib_div::getFileAbsFileName($TYPO3_CONF_VARS['CLASS_REGISTER'][$className]);
+		}
+
+		if (!is_null($fileName) && $fileName) {
+			t3lib_div::requireOnce($fileName);
+		}
+
+		return class_exists($className);
+	}
+
+	/**
 	 * Return classname for new instance
 	 * Takes the class-extensions API of TYPO3 into account
 	 * Usage: 17