UBBCode

Replaces the UBB tags listed below with HTML tags, and vice versa.
Also keeps the line feeds in the text and removes all HTML tags.

UBB Tags:
[b]...[/b] bold
[i]...[/i] italic
[code]...[/code] source code
[img], [/img] images
[quote]...[/quote] blockquote
[url]http//www.link[/url] links
[url=http//www.link]name[/url] links
[email]me@home.de[/email] email link
[email=me@home.de]name[/email] email link

Additional Tags:
[u]...[/u] underline
[center]..[/center] center
[color=name]...[/color] colors

For a description of ubbcodes see: http://community.infopop.net/infopop/ubbcode.html

FUNCTIONS:
function encode($str)
function decode($str)
function strip($str)
function listCodes()