[nlindahl]

You may want to start by reading the Smarty Docs for a decent idea of what you are capable of doing with a tpl file.

In head.tpl, you'll have the $cat variable available to you. You can use that with if/elseif statements to determine what category you are in and then use the smarty include statement to display the contents of another tpl file or html.

In a case like this all you would have in head.tpl would be a lot of if statements for each category followed by include statements. All output to the browser would be in the various files you include.