[PHP] Problem with mail

[Haseeb Iqbal]

hi all while sending mail from php i keep getting this 
"Server Error " on line 2
and this is on line 2
mail("[EMAIL PROTECTED]", "the subject", "hi","From: [EMAIL PROTECTED]"."Reply-To: 
[EMAIL PROTECTED]"."X-Mailer: PHP/" . phpversion());

what is wrong with this what i am going wrong
??
regards
Haseeb