Simple Way To Insert Comma?

[iceman2g]

I'm sure it's really simple, but I can't seem to get it.

I have a number that looks like this 1233 i'd like to have it displayed like this 1,233.

Another example.

before:
14556

after:
14,556

[gufmn]

number_format d00d

[iceman2g]

Knew it was something simple. Thank you.