Save Radio Button Value Using PHP/MySQL

CREATE TABLE IF NOT EXISTS `gender` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `gender` varchar(10) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=6 ;

<?php $gender=$_GET['gender']; ?>
<form action="save.php" method="post">
Select Gender:<br />
  <label>
  <?php 
  if ($gender=='male')
  {
  echo '<input name="gender" type="radio" value="male" checked="checked" />';
  }
  if ($gender=='female')
  {
  echo '<input name="gender" type="radio" value="male" />';
  }
  ?>
  male
  </label>
  <br />
  <label>
  <?php 
  if ($gender=='female')
  {
  echo '<input name="gender" type="radio" value="female" checked="checked" />';
  }
  if ($gender=='male')
  {
  echo '<input name="gender" type="radio" value="female" />';
  }
  ?>
  female
  </label><br />
  <input name="Save" type="submit" value="save" />
</form>

<?php
$mysql_hostname = "localhost";
$mysql_user = "root";
$mysql_password = "";
$mysql_database = "radio";
$prefix = "";
$bd = mysql_connect($mysql_hostname, $mysql_user, $mysql_password) or die("Could not connect database");
mysql_select_db($mysql_database, $bd) or die("Could not select database");
?>

<?php
session_start();
include('connection.php');
$gender=$_POST['gender'];
mysql_query("INSERT INTO gender(gender)VALUES('$gender')");
header("location: index.php?gender=$gender");
mysql_close($con);
?>