falls php:

Code:
<?php
list($url,$port)= explode (':',"deineseite.de:80");
if (empty($port)){$port = 80;}

$con= @fsockopen(server($url), $port, $errno, $errstr, 5);
         if ($con){
             echo 'Server online';
         }else{
             echo 'Server offline';           
         }
function server($url){
         if(strstr($url,"/")){$url = substr($addr, 0, strpos($url, "/"));}
         return $url;
}
?>