Masking server IP with fsockopen?

here's my code so far

$url='http://whatismyipaddress.com/';
$proxy = '128.130.35.76'; // proxy IP, change this according to your proxy setting in your IE or NS
$port = 80; // proxy port, change this according to your proxy setting in your IE or NS

$fp = fsockopen($proxy, $port);
fputs($fp, "GET $url HTTP/1.0\r\nHost: $proxy\r\nConnection: close\r\n\r\n");
while(!feof($fp)){
  $line = fgets($fp, 4000);
  print($line);
}
fclose($fp);

The connection to the proxy server seems to work just fine, but still after loading the page it still shows the IP of my server.

Is there any way to hide my servers' IP behind the proxy I've chosen?