PHP Code Captcha

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<?php
session_start();

?>
<form action="" method="post">
<table width="407"  style='border: 1pt dashed #0000CC;padding: 10px;'>

<tr>
  <td>Input Kode
  <td>
  <td><img src="setcaptcha.php"></td>
</tr>
<tr>
  <td>
  <td>
  <td>
  <input type="text" name="kodecaptcha" size="6" maxlength="6">
   (Masukkan 6 kode diatas)
  </td>
</tr>

<tr>
<td>
<td>
<td><input name="Simpan" type="submit" id="Simpan" value="Simpan" />
</td></tr>
</table>
</form>


<?php
if(isset($_POST["Simpan"])){


if($_POST["kodecaptcha"]==$_SESSION["captcha_session"]){

echo"<h1>Sukses Simpan....</h1>";
}
else{
echo"<h1>Gagal Simpan....</h1>";

}
}
?>

+++++++++++++++++++

<?php

session_start();

header("Content-type: image/png");

$captcha_image = imagecreatefrompng("captcha.png");

$captcha_font = imageloadfont("font.gdf");

$captcha_text = substr(md5(uniqid('')),-6,6);

$_SESSION['captcha_session'] = $captcha_text;

$captcha_color = imagecolorallocate($captcha_image,0,0,0);

imagestring($captcha_image,$captcha_font,15,5,$captcha_text,$captcha_color);

imagepng($captcha_image);

imagedestroy($captcha_image);

?>