{assign var=viewedProduct value=false}
{if isset($isViewedProduct)}{assign var=viewedProduct value=$isViewedProduct}{/if}

{assign var=cartProduct value=false}
{if isset($isCartProduct)}{assign var=cartProduct value=$isCartProduct}{/if}

{assign var=relatedProduct value=false}
{if isset($isRelatedProduct)}{assign var=relatedProduct value=$isRelatedProduct}{/if}

{assign var=productPage value=false}
{if isset($isProductPage)}{assign var=productPage value=$isProductPage}{/if}

{include file="{$tpl_dir}./includes/producttitle_@(id).tpl" product=$product isViewedProduct=$viewedProduct isCartProduct=$cartProduct isRelatedProduct=$relatedProduct isProductPage=$productPage}