Changes needed in PHP Script

Hi all, I need some changes to be done in one of the scripts I bought recently.

Please have a look at the website.

http://www.gigz.co.nz.

Basically, I need php expert to fix the bugs that I have found in the script and do some additional changes on top of it.

1) Facebook Connect Bug: I had Facebook connect on top of twitter connect in website, but recently i removed it.
( Problem: After you press connect with Facebook, it goes to small popup screen where it connect to your profile but then it doesn't go further.) even sometime when user is logged in on facebook on other tab of browser and tries to log on into gigz.co.nz. it says user already logged in on top left - instead on actually loggin in that user.

2) Minor Messages Bug: when i send a message from profile's email to someone else's email - "when you press enter" makes it look like .\\n \\\r \\n"(Would cost you $50 for one report and would be doing complete analysis on your website)..\\\\r\\\\n..\\\\r\\\\n\\\\r\\\\nLet me know if you need further help.\\\\r\\\\n\\\\r\\\\n.

3) Payment Currency type: when user buys anything, he thinks that its in New Zealand dollar but when it goes to PayPal website, it turns out to be US Dollars. (Changing Currency from admin panel so that when it goes to paypal it remain in New Zealand Dollar).

4) Possible way from admin panel to link money transactions, so that admin knows money been transfered for particular gigz and he should be able to releasing money from admin panel to suppliers.

5) Lastly some UI Changes: http://www.croissantsocial.com/bestratinggigs/

Please bid only if you are comfortable doing these changes. We only want people taking this job who know they can complete it which are why we insist you read the detailed brief before we award the project.

Cheers