[PHP] redirection, same host, two domains

[Alexandru Martin]

   Okay, here is my problem. I had a site hosted on a sub domain 
(mysite.domain.com) , now I registered my own domain, mysite.com . The 
thing is mysite.com is still hosted on mysite.domain.com. What i want to 
do is :  If people type in their browsers mysite.domain.com redirect to 
mysite.com and if they type mysite.com to display the page.
   I'm guessing it should be something like this : if ( refferer = 
mysite.domain.com ) { redirect to mysite.com } else { my html code }

P.S:  I need this because I don't want google to think it's a duplicate 
site.

Thank you,
Alexandru Martin.
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