Changing product appearance

[GiganticDays]

I currently use the Smart theme and have one product per page. The product template is "One product per row image on left" which results in an image on the left (as you might expect) and a colum of text description, price etc on the right. What I would like to do is increase the width of the text area (using up some of the space taken up by the image if necessary). What template do I need to modify and how?
TIA
An example can be seen here
http://www.phoenix-pcs.co.uk/acatalog/Sumvision_Opus_Pro_MP3_MP4_Player.html

[jont]

The template is Act_ProductLine.html

may be worth checking out http://community.actinic.com/showthread.php?t=16945 for solutions to sorting the column of text around images

[GiganticDays]

That's just the ticket Jont, your help (and that of the posters in the other thread) is much appreciated.