[SMARTY] php function call

Ok I have a group of Smarty variable assignments that I want to put in
a php function so I can call it at various points in the script.
However, it's not returning any data when I call the function. Any
ideas?

<?php 
function meat($obj)
{
 $obj->assign('template_var1', $var1);
 $obj->assign('template_var2', $var2);

 return $obj;
}

// Smarty setup and object blah blah

$template = "page.htm";
$var1 = "yes";
$var2 = "no";

meat($obj);

$smarty->display($template);

?>

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