Shipping.php Undefined index error. 1.5.x

hello

i now modded shipping method.


2011-11-29 8:02:28 - PHP Notice: Undefined index: shipmeth1 in C:\wamp\www\catalog\controller\checkout\shipping.php on line 44

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line 44

$this->session->data['shipmeth'] = $this->request->post['shipmeth1'];

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shipping.tpl


<td style="text-align:left"><select name="shipmeth1">
<option value="">Select (optional)</option>
<option value="09:00 - 10:00">09:00 - 10:00</option>
<option value="10:00 - 11:00">10:00 - 11:00</option>
</select>
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please help me.

thank you.