function __autoload($class_name){
    $paths[]=ABS_PATH.'core/classes/'.strtolower($class_name).'.php';
    $paths[]=ABS_PATH.'core/classes/'.strtolower($class_name).'/'.strtolower($class_name).'.php';
    $paths[]=ABS_PATH.'core/modules/'.strtolower($class_name).".php";
    $paths[]=ABS_PATH.'core/modules/'.strtolower($class_name)."/".strtolower($class_name).".mod.php";
    foreach($paths as $path){
      if(file_exists($path)){
        require_once($path);
        logger::AddEvent("class '$class_name' success loaded");
        return true;
      };
    }
    $str="Ooops, i can't load class '$class_name', I searched this in paths:\n ".implode(";\n ",$paths);
    if(class_exists('logger')&&$class_name!='logger'){
    	logger::AddEvent($str, 'err');
    }
    else{
    	die($str);
    }
}