BBCode is a simple markup language used for formatting comments. Valid codes are:

bold: [b]Maecenas at nisl.[/b]
italics: [i]Maecenas at nisl.[/i]
underline: [u]Maecenas at nisl.[/u]
url: [url]http://www.mysite.com[/url], [url=http://www.mysite.com]Maecenas at nisl.[/url]
image: [img]http://www.mysite.com/mypic.png[/img]
quote: [quote]Maecenas at nisl.[/quote]
code: [code]Maecenas at nisl.[/code]
size: [size=12]Maecenas at nisl.[/size]
color: [color=#FF0000]Maecenas at nisl.[/color]