Problems with assigning function to templates

[Jikson26]

Hi I am using various template systems to test the functions in SSI.php, but everytime I assign a function like this:

Koodi [Valitse] Laajenna

$template->assign('latestmember', ssi_latestMember());
$template->display('header.tpl');

The output will always be at the VERY top of the page, not where I wanted it to show in the .tpl. I am using smarty template class for that. What is wrong?