<?php if(isset($_COOKIE['ID_my_site']))
{
$username = $_COOKIE['ID_my_site'];
$check = mysql_query("select id from users where username = '$username' limit 1")or die(mysql_error());
//$pass = $_COOKIE['Key_my_site'];
//echo $check;

$row = mysql_fetch_array($check);

echo 'username should be: '.$row[0];

}
?>