assign php for smarty template

[jasondavis]

I have a file called profile.php which has this bit of code in it

//site thumbnail check////////////
$filename = "sitethumbs/".$user['login'].".jpg";
if (!file_exists($filename)) {
$t->assign('sitethumbs', $filename);
}
/////end////////////

then I have a smarty template (profile.html)

{if ($sitethumbs)}
website thumb({$sitethumbs})
{/if}

The result is=

website thumb
sitethumbs/jasondavis.jpg

So the problem is that it assigns the $filename to $sitethumbs even if the file does not exist, I need it to only do so if the file actually exist, any ideas I have been fighting this for 3 days now with no luck yet

[wilku]

if (!file_exists($filename)) {
$t->assign('sitethumbs', $filename);
}

This will assign ONLY if file doesn't exist. Remove the exclamation mark and it should work.