http://www.icyphoenix.com/viewtopic.php?f=36&t=1328&p=14288#p14288
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rakso
Sat 19 May, 2007 14:21

Re: New Template: Aqua Gloss
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The code: 
// Select the header type and set some templates related vars.
if ( ($theme['template_name'] == 'mg_themes') && ( ($theme['body_background'] == 'gray') || ($theme['body_background'] == 'ice') ) )

No is in includes/page_header.php