choose a name from the drop-down list or else exit, can write in the text box

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i have a drop down list and a text box. there is names of animals in drop down list. problem is where, there may not a name for choosing in drop down list so when the requested name does not exit, user should can type his/her favorite animal in text box after checked check box(when check box checked, drop down list should be disabled and when unchecked check box should disabled ). and in last step, send the value of drop down list or text box to data base.

<form name="f" action="" method="post">
echo"choose an animal".'<br/>';
echo '<select name="animals">';
echo'<option> bear </option>';
echo'<option> cat </option>';
echo'<option> lion </option>';
echo'<option> monkey </option>';
echo'</select>';

echo"or write if is not in list".'<br/>';
echo'<input type="checkbox" name="checkbox">';
echo'<input type="textbox" name="animals">';
echo'<input type="submit" name="submit" value="submit">';
</form>
if(isset($_POST['submit']))
{
    $db_host = 'localhost';
    $db_name= 'site';
    $db_table= 'animals';
    $db_user = 'root';
    $db_pass = '';

    $con = mysql_connect($db_host,$db_user,$db_pass) or die("خطا در اتصال به پايگاه داده");
    $selected=mysql_select_db($db_name, $con) or die("خطا در انتخاب پايگاه داده");

    $ins = "INSERT INTO $db_table (animal_name)
            VALUES ('" . mysql_escape_string($_POST['animals']) . "')";
    $saved=mysql_query($ins );

    mysql_close($con);
}


<?php
    echo"choose an animal".'<br/>';
    echo '<select name="animals" id="animalDropdown">';
    echo'<option> bear </option>';
    echo'<option> cat </option>';
    echo'<option> lion </option>';
    echo'<option> monkey </option>';
    echo'</select>';

    echo"or write if is not in list".'<br/>';
    echo'<input type="checkbox" name="checkbox" id="checkbox" onclick="onClickCheckbox()">';
    echo'<input type="textbox" name="animalstext" id="animals">';
    ?>

    <script>
    onClickCheckbox();

    function onClickCheckbox( )
    {
        if( document.getElementById("checkbox").checked == true )
        {
            document.getElementById("animalDropdown").disabled = true;
            document.getElementById("animals").disabled = false;
        }
        else
        {
            document.getElementById("animalDropdown").disabled = false;
            document.getElementById("animals").disabled = true;
        }
    }
    </script>

This does the active/deactive job. Use the rest of your PHP code in order to insert the data in database. By the way I guess you need a submit button as well.