$sitio = "ip";
$loginserver = 2104;
$loginserver = fsockopen($sitio,$loginserver,$errno,$errstr);

if(!$loginserver)
{
echo "<img src='../images/cross.png' alt='(Offline)' />";
}else{
echo "<img src='../images/tick.png' alt='(Online)' />";
fclose($loginserver);
}