Another PHP problem

Sorry chaps, but can anyone eell me why the code below produces only error 
messages?

<?PHP
if ($site == "pwp") {
$sitecss = "http://members.aol.com/newstyle.css";
$sitename = "Peter's Web Page";
$siteurl = "http://members.aol.com/reywob";
} elseif ($site == "rm") {
$sitecss = "http://www.railwaymodelling.co.uk/style.css";
$sitename = "Railway Modelling";
$siteurl = "http://www.railwaymodelling.co.uk
} else {
$sitecss = "http://www.narrowgauge.f2s.com/style.css";
$sitename = "Narrow Gauge on the web";
$siteurl = "http://www.narrowgauge.f2s.com";
}
?>

Thanks,
Peter.

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