<?
session_start();
ob_start(); 
include "config.php";
function giris() {
?>
<body>
<form action=\"index.php?sayfa=hesapyarat\" method=\"post\">
  <div align=\"center\">
    <p class=\"style1\">ÜYELİK FORMU </p>
    <table width=\"328\" border=\"1\">
      <tr>
        <th width=\"139\" scope=\"row\">K.ADI:</th>
      <td width=\"173\"><input type=\"text\" name=\"nick\" />&nbsp;</td>
    </tr>
      <tr>
        <th scope=\"row\">ŞİFRE:</th>
        <td><input type=\"password\" name=\"pw\" />&nbsp;</td>
    </tr>
      <tr>
        <th scope=\"row\">&nbsp;</th>
      <td><input type=\"Submit\" value=\"KAYDET\" />&nbsp;</td>
    </tr>
    </table>
    <p><strong><em>ZCDesign İnternet Hizmetleri </em></strong></p>
  </div>
</form>
</body>
<? }
function hesapac(){
$nick = $_POST["nick"];
$pass = md5($_POST["pw"]);
$tarih = date ("d/m/y");   }
if (($nick == "") or ($pass == "")) {
header("location:index.php?sayfa=login&error=1");
}
else {
$add = mysql_query("insert into register(nick,pw,tarih) values ('$nick','$pass','$tarih')  ");
if(! $add) {
    print "Üye ekleme başarısız !";
}
else {
header("location:index.php");
}
?>

Eger hata verirse hata kodunun oldugu satırın 2 ustu ve 2 altıyla birlikte atarsan yardımcı olabilirim.