[ElegantXMods.com]

Open skin1/customer/home.tpl and find the line

<div id="center-main">

ABOVE this line, insert this code

{if $main eq "pages" or ($main eq "product" and $product["productid"] eq 111)}
    {include file="customer/home_main.tpl"}
{else}

and replace 111 with your chosen product ID (or you could use the SKU / product code instead: use $product["productcode"] ).

now scroll down and find

{include file="poweredby.tpl" }

and ABOVE this insert this line:

{/if}