<?php

$url = fsockopen("www.google.com", 80, &$errno, &$errstr, 30);
if(!$url) {
//site is down
echo "<b>Google is <font color=\"red\">down!!</font></b>\n"; }
//site is up
else
{
echo("<a href=\"http://www.google.com\">Google</a>");
}

?>