[drupal-support] howto widen the content part of the page

[Torsten Flammiger]

hello,

how can i make the content part of the page more wider then the default?
I would like to have it to be best at 1024x768 - dont beat me! :-)
there ist much waste of free space on the right side... If i create a 
foto album there is only space for two little thumbs/row but there would 
be room for another three pics...

I searched the css-files in my default theme directory but could not 
find anything helpfull...

TIA
Torsten