[PHP] calling static method within class

[blackwater dev]

I have a class that won't be instantiated...so basically just a bunch
of static methods.

How do I call one of the class' static methods from within another
method?  Can't use this, and self doesn't work...this is php4.

Thanks.

Class Foo{

   function getMe(){
    return "me";

  }

  function getUs(){
   $us=xxx::getMe();
   $us.="& me";

  }
}

echo Foo::getUs();

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