stockfeed problem

I have written this VQMOD when the returned data from my stockfeed when it is called it shows the value and the buy button, but when returns other then a value or a date i need the no buy to work, it shows the date correctly but it does not take away the buying button function where am i going wrong help someone please!!

<file name="catalog/controller/product/product.php">
<operation>
<search position="before"><![CDATA[$this->load->model('tool/image');]]></search>
<add><![CDATA[
$ch = curl_init();

$urlStringData = "http://www.******.co.uk/shop/templates/*****/StockAvailability2.asp?itemcodes=".$product_info["model"];
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //Set curl to return the data instead of printing it to the browser.
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT,10);

curl_setopt($ch, CURLOPT_URL, $urlStringData );

$hafelestatus = curl_exec($ch);
curl_close($ch);
$pos = strrpos($stockstatus, "/" );

if($pos === false)
{
$this->data['stock'] = $stockstatus ;
}
else
{
$this->data['nobuy'] = "1";

}
]]></add>
</operation>
</file>

Well, it looks like you've properly setup a $nobuy variable, but just setting that up is not going to prevent the item from being purchased. There's a lot of ways you could do that, but probably the easiest one would be to wrap the add to cart button in an if statement, and not show it if $nobuy = 1; The problem with that though is that you'd need to do it in a lot of areas, so maybe doing some work to the addtocart function to return an error if $nobuy is set to one would be a faster approach.