Numbering Systems

[TmC]

Hi, today i have a question that is a bit far from cracking but it fits the reverse eingeneering and programming tasks:

I'm coding in visual basic a tool for a friend that converts strings betwen bases.

I am stuck into 3 conversions:

Octal to String
String to Base60
Base60 to String

Is there a way to convert octal to string? (or octal to hexadecimal so then use hexadecimal to string?)
Does someone have sample sources in visual basic? I searched through planet source code but it does not have something like that or has something that overflows.

As for base60:
I know that base64 has A->Z, a->z, 0->9, +/
What get's off in base60? +/ and...what?
Anyone can help me?

Thanks in advance to all.