Notice: Undefined index error in product page.

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Notice: Undefined index: shippingArea in /var/www/vhosts/mysite.com/httpdocs/newsite/catalog/view/theme/default/template/product/product.tpl on line 353 

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  <!-- *********  TAB-SHIPPING **********    -->

<div id="tab-shipping" class="tab-content">
<form method="post">
<select name="shippingArea">
			<option>Selectoption>
			<option>N.Y.<option>
			<option>Paris</option>			
</select>
<input name="Submit" type="submit" value="Υπολόγισε" />
</form>
<?php
$area=$_POST['shippingArea'];
?> 
<?php
$number = preg_replace("/[^0-9]/", '', $special)/100; // ditch anything that is not a number 
echo "<br>";
$weightClean = preg_replace("/[^0-9]/", '', $weight)/100; // ditch anything that is not a number 
if ($number>=119.00 && $area=="Αττική-Πειραιάς")
	  {
	  echo "Free shippment!";
	  }
	  elseif ($number<=119.00 && $weightClean<=5.00 && $area=="Αττική-Πειραιάς")
	  {
	  echo "DHL the fee is € 2,70. ";
	  }
       ..............
        .............
?> 
  </div>

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<?php 
if (!isset($_POST['shippingArea']))
{
//If not isset -> set with dumy value undefine
$_POST['shippingArea'] = "undefine";
} 
?>