Mambo problems

I've installed Gallery as a component of Mambo and i'm recieving an error or two:

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/nod/public_html/templates/yops_boxed_blue_lt/index.php:1) in /home/nod/public_html/gallery/session.php on line 60

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/nod/public_html/templates/yops_boxed_blue_lt/index.php:1) in /home/nod/public_html/gallery/session.php on line 60

I've got a nasty feeling this relates to the template i'm using, yet despite changing templates and experimenting with </head> combinations i'm still getting no joy.

Any advice would be greatly appreciated. Cheers..

----
Gallery URL: http://www.white-trash.co.uk/index.php?option=com_gallery&Itemid=29
Gallery version: v1.4.3-RC3
Apache version: Apache/2.0.47
PHP version: 4.3.3