add and edit in one view

[eluser]mardon[/eluser]
Hi, I want add and edit records in db in one view

Code:

<div id="addcert_form">
    &lt;?php
    echo $akce;
    if ($akce == 'add') {
        echo form_open('admin/add_cert');
    }
    else {
        echo form_open('admin/edit_cert/'.$id);
    }
    echo $ser_cislo;
    ?&gt;
    <ul>
        <li>
            <label>Sériové číslo:</label>
            <div>
&lt;?php echo form_input(array('id' => 'ser_cislo', 'name' => 'ser_cislo', 'value'=>$ser_cislo)); ?&gt;
            </div>
        </li>
        <li>
            <label>Počátek platnosti:</label>
            <div>
&lt;?php echo form_input(array('id' => 'pocatek', 'name' => 'pocatek','value'=>$pocatek)); ?&gt;
            </div>
        </li>
        <li>
            <label>Konecplatnosti:</label>
            <div>
&lt;?php echo form_input(array('id' => 'konec', 'name' => 'konec','value'=>$konec)); ?&gt;
            </div>
        </li>
        <li>
            <label>Uživatel:</label>
            <div>
&lt;?php echo form_dropdown('id_user', $options, '1'); ?&gt;
            </div>
        </li>
        <li>
            &lt;?php
            if ($this->session->flashdata('login_error')) {
                echo "Nesprávné přihlašovací údaje";
            }
            echo validation_errors();
            ?&gt;
        </li>
        <li>
&lt;?php
if ($akce == 'add')
echo form_submit(array('name' => 'submit'), 'Přidat');
else echo form_submit(array('name' => 'submit'), 'Uložit');?&gt;
        </li>
    </ul>

but I have problem with value in input form when I add a record the value isnt set.
Its bad idea to have one form for add and edit? How to solve my problem?