<?php    
   if(isset($_POST['button']))
   {
     include "/scripts/connection.php";
   }
  ?>
  <form id="form1" name="form1" method="post" action="">
    <p>Введите логин</p>
    <p>
  <input name="Name" type="text" maxlength="16" />
    </p>
    <p>Введите пароль</p>
    <p>
  <input name="Pass" type="password" maxlength="16" />
    </p>
    <p>
      <input type="submit" name="button" id="button" value="Подтвердить" />
    </p>
  </form> 

<?php 
   define("HOST","ххх");
   define("USER","ххх");
   define("PASS","ххх");
   define("DB","ххх");
   
   $link = mysql_connect(HOST,USER,PASS) or die (mysql_error());

   mysql_select_db(DB, $link);
   
   echo"works";
?>