Get Variable

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A .tpl page generate this link (and works fine!):

 

{$this_path}sendtoafriend-form.php?id_product={$smarty.get.id_product|intval}

 

My problem is the following:

 

how can I have a link like this:

 

my_new_page.php?my_variable={$smarty.get.id_product|intval} ?

 

I simply need to get my_variable in my_new_page. In effect this must be very easy, but I don't understand how. There are no clear samples...