Pfff... Sorry for the second post. I couldn't find the first one on
Google groups.
I tried changing the self object. But I wasn't allowed to do it. I got
an error message when I did that:
"Can't change the value of self"

So I changed it to:

class String
	def rtrim(character)

		ret = self
		if self[-1, 1] == character.to_s
			ret = self[0, self.length - 1]
		end
		return ret
	end

	def ltrim(character)
		if self[0, 1] == character.to_s
			ret = self[1, self.length]
		end
		return ret
	end
end

This works. But I would rather see the first object changed. Is this
possible?