How to add an Internet RADIO STATION to RhythemBox running with a .php extension?

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http://askubuntu.com – Guys, There's a Internet Radio Station called Sun FM in Sri Lanka. Among those radio stations running in Sri Lanka, Sun FM is one of my best radio stations I really like to listen everyday. I'm listening it by online. But the problem came when I'm trying to listen it via RhythemBox Player. when I'm going to run that, error comes and says "Couldn't start playback, This appears to be a text file." Here is the URL of Sun FM Online Radio - http://www.sunfm.lk/fb_frame.php And this is the URL of Sun FM web site - http://www.sunfm.lk/ Guys.., how can I add this station in the correct way and li (HowTos)