What is the right way to load own helpers

[eluser]Aken[/eluser]
You likely named your helper file incorrectly. CodeIgniter looks for a specific structure when it comes to the file name. In your case, it is looking for the file "common_helper.php" in the "application/helpers/" folder. If you rename your file to that, everything will work fine. There is zero need to modify the Loader library.