[Jon]

You have to change this:

$smarty->assign("main", "ourstory.tpl");

to:

$smarty->assign("main", "ourstory");

Then edit your skin1/customer/home_main.tpl and somewhere in the middle put:

{elseif $main eq "ourstory"}
{include file="skin1/customer/main/ourstory.tpl"}

Where outstory.tpl is in the skin1/customer/main/ folder.