Drupal6 work with namespace

Hi,

I have using drupal6 with custom php code. Its two different places(mean two different repository). Previously i have tried with required some files(custom code) from drupal and its worked fine. now i have changed custom php code with namespace classes(eg: "namespace base\mod") now the problem is drupal6 doesn't supporting? with namespace code from custom code. Can any one have handle this problem?