URGENT: SMALL PHP JOB

Hi, I have a IP cloaking script that basically display's different versions of a site depending on user IP. Please see the attached file. It basically checks for list of IP's and tries to match it with user IP if a match is found it shows page A "site/default.php" else user is shown a different page B "site/other.php". I need little modification to script which will do random selection for page B option. So basically if no ip match found and user is in page B category it will show a random page from the list "site/other.php", "site/other1.php" or "site/other2.php". Please bid considering it's a quick job and if you can do it quickly. Thanks Naseer