[Erro] session_start() [function.session-start]

[JaguA]

Minha pagina ta dando esse erro..

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at C:\AppServ\www\index.php:12) in C:\AppServ\www\login.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\AppServ\www\index.php:12) in C:\AppServ\www\login.php on line 2

Essa é o meu login.php

<?
session_start();

$mtime = microtime(); 
$mtime = explode(" ",$mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$starttime = $mtime; 

// Incluindo arquivos
require "_req/config.php";
require "_req/cnn.php";
require "_req/anti_inject.php";
require "_req/sql_protect.php";

if (isset($_SESSION['ses_login'])) {
    $dados_login_q = mssql_query("SELECT * FROM users WHERE Login='$ses_login'");
    $dados_login = mssql_fetch_array($dados_login_q);
}
?>
<?
if (!$ses_login) {
    echo "<table border='0' cellpadding='0' cellspacing='0' width='183'>
    <tr>
    <td background='_img/login_bg.gif' valign='top'>
         <table border='0' cellpadding='0' cellspacing='0' width='183'>
         <tr>
         <td height='39'></td>
         </tr>
         <tr><form name='form1' method='post' action='?'>
         <td height='36'>
            <table border='0' cellpadding='0' cellspacing='0' height='40' width='183'>
              <tr valign='top'>
              <td height='19' width='52'></td>
              <td width='79'><input name='ses_login' type='text' id='ses_login' size='10' class='input'></td>
              <td rowspan='2' valign='middle' width='52'><input name='submit' src='_img/login_bt_in.gif' border='0' height='36' type='image' width='38'></td>
              </tr>
              <tr>
              <td height='20'></td>
              <td><input name='ses_senha' type='password' id='ses_senha' size='10' class='input'></td>
              </tr>
              </table>
         </td></form>
         </tr>
         <tr>
         <td height='64' valign='top'><table border='0' cellpadding='0' cellspacing='0' height='4' width='183'>
                <tr>
                <td></td>
                </tr>
                </table>
            <table border='0' cellpadding='0' cellspacing='0' width='183'>
            <tr>
            <td>
                <table border='0' cellpadding='0' cellspacing='0' width='183'>
                <tr>
                <td height='21' width='57'></td>
                <td><a href='?i=c900a8bc5d4'><img src='_img/usuario_cadastro.gif' border='0' height='17' width='106'></a></td>
                </tr>
                <tr>
                <td height='21'></td>
                <td><a href='?i=1f1c03efbf0'><img src='_img/usuario_recuperarsenha.gif' border='0' height='17' width='106'></a></td>
                </tr>
                </table>
            </td>
            </tr>
            </table>
        </td>
         </tr>
         </table>
         </td></tr></table> ";
} else { 
    $level_check = mssql_query("SELECT level FROM users WHERE Login='$ses_login'");
    $level = mssql_result($level_check, 0, 0);
    if ($level == 0) { $painel = "Painel do Usuário"; $dir = "painel"; }
    if ($level == 1) { $painel = "Painel do Game Master"; $dir = "gm"; }
    echo "<table border='0' cellpadding='0' cellspacing='0' width='183'>
            <tr>
            <td background='_img/login_bg_seson.gif' valign='top'>
            <table border='0' cellpadding='0' cellspacing='0' width='183' height='143'>
             <tr>
             <td class='usuario'><div align='center'><b>Bem Vindo: $ses_login</b><br><br><b><a href='?i=$dir'><span class='usuario'>$painel</span></a><b><br><br><b><a href='?i=215521f1d88'><span class='usuario'>Sair</span></a></b></div></td>
             </tr>
             </table></td></tr></table>";
             
        
    }
if(isset($_POST['ses_login'])){
    $ses_login=$_POST['ses_login'];
    $ses_senha=$_POST['ses_senha'];
    
    $ses_senha = md5($ses_senha);
    
    $qChecaLogin = mssql_query("SELECT * FROM users WHERE Login='".$ses_login."'");
    $ChecaLogin = mssql_num_rows($qChecaLogin);
    
    if ($md5 == 1) {
        $qChecaSenha = mssql_query('exec ChecaSenha "'.$ses_senha.'", "'.$ses_login.'"');
        $ChecaSenha = mssql_num_rows($qChecaSenha);
    } else {
        $qChecaSenha = mssql_query("SELECT * FROM users WHERE Login='".$ses_login."' AND passwd='".$ses_senha."'");
        $ChecaSenha = mssql_num_rows($qChecaSenha);
    }

    if ((eregi("[^0-9a-zA-Z._-]", $ses_login)) ||
    (eregi("[^0-9a-zA-Z]", $ses_senha)) )
        inject();
    elseif($ChecaLogin == 0) 
    {
    echo "<script>alert('Login não encontrado')</script>";
    echo "<script>window.location='?'</script>";
    }
    elseif($ChecaSenha == 0)
    {
    echo "<script>alert('Senha Incorreta')</script>";
    echo "<script>window.location='?'</script>";
    }
    else {
        $level_check = mssql_query("SELECT level FROM users WHERE Login='$ses_login'");
        $level = mssql_result($level_check, 0, 0);
        if ($level <= 0) { $dir = 'painel'; }
        if ($level >= 1) { $dir = 'gm'; }
        session_start();
        $_SESSION["ses_login"]=$ses_login;
        echo "<script>window.location='?i=$dir'</script>";
    }
}
?>

[Kutxitxo]

COmo é seu index.php?

Tvz algum include d arquivo ou o proprio index já tenha iniciado uma sessao! :)

[JaguA]

Na verdade não, mas eu tirei o session_start();

do login.php

e coloquei no index.php

e funciono

muitissimo obrigado cara =]...