[keystone]

I currently have a "custom title mod" set up in my customer/home.tpl like this

{* Custom Title Tag Start *}
{if $main eq "catalog" and $current_category.category eq ""} 
Scented Candles Wholesale Candles Unscented Candles Wedding Candles Holders
{section name=position loop=$location step=-1} 
{math equation="x-1" x=$smarty.section.position.total assign="secondlast"} 
{if $smarty.section.position.iteration ne $smarty.section.position.total}{$location[position].0|escape}{/if} 
{if $smarty.section.position.iteration ne $secondlast}{if not %position.last%}  {/if} {/if} 
{/section} 
{elseif $main eq "help"} 
{$lng.txt_subtitle_help} 
{elseif $main eq "cart"} 
{$lng.txt_subtitle_cart} 
{elseif $main eq "checkout"} 
{$lng.txt_subtitle_checkout} 
{elseif $main eq "order_message"} 
{$lng.txt_subtitle_thankyou} 
{elseif $main eq "wishlist"} 
{$lng.txt_subtitle_wishlist} 
{elseif $main eq "giftcert"} 
{$lng.txt_subtitle_giftcerts} 
{elseif $main eq "pages"} 

{$page_data.title} - Wholesale Candles Wedding Favors Reed Diffusers

{else} 
{section name=position loop=$location step=-1}{$location[position].0|escape}{if not %position.last%} - {/if}{/section}{/if}

{* Custom Title Tag End *}

I have added a new field in the database table xcart_pages called meta_title. I want to change this part

{elseif $main eq "pages"} 

{$page_data.title} - Wholesale Candles Wedding Favors Reed Diffusers

to look more like

{elseif $main eq "pages"} 

{$page_data.meta_title} 

so it will display the info from the meta_title field. I'm not sure what php file I need to update so that the meta_title variable will be defined and displayed. Can anyone help with that?