facebook - How do I resolve the error "PHP Notice: Use of undefined constant"?

I have a strange error message after using the post to wall function. It did successfully post to the wall however i got a very weird strange error.

[30-Jan-2012 23:36:49] PHP Notice: Use of undefined constant message
- assumed 'message' in C:\www\jetstar\starpick\rewards.php on line 33

[30-Jan-2012 23:36:49] PHP Notice: Use of undefined constant picture
- assumed 'picture' in C:\www\jetstar\starpick\rewards.php on line 34

[30-Jan-2012 23:36:49] PHP Notice: Use of undefined constant link -
assumed 'link' in C:\www\jetstar\starpick\rewards.php on line 35

[30-Jan-2012 23:36:49] PHP Notice: Use of undefined constant name -

assumed 'name' in C:\www\jetstar\starpick\rewards.php on line 36

[30-Jan-2012 23:36:49] PHP Notice: Use of undefined constant caption
- assumed 'caption' in C:\www\jetstar\starpick\rewards.php on line 37

This is the codes i use

$facebook->api("/me/feed", "post", array(
    message => "I have won a ".$prizename,

    picture => "http://i1172.photobucket.com/albums/r574/092810c/starpicklogo-1.png",
    link => "https://apps.facebook.com/starpick/",
    name => "StarPick",
    caption => "Stand to Win Attractive Prizes!!!"));