iframe problem

Hi.

Here is my problem:
I have main template page which should show one big image on top side and on the bottom side an iframe which includes another html for scrolling thumbnails. Each thumbnail has own id and if i click them then the big image must be shown on top side. But it opens in iframe and actually loads all the main template page with this big image and thumbnails area inside to iframe.

For main template i have index.php where $tmpl_menu = 'big.htm' and for sub-template inside iframe i have pics.php where i load another template for thumbnails.

Maybe you can explain what is wrong. Sorry i can't paste code here becouse server is down right now.

Hi,

I think this is not about TBS, but only HTML.
I think the attribute
   target="_parent"
added to the thumbnail link should change the main page instead if the iframe page.