Posted on: March 28, 2011, 07:10:58 AM
exact dimensions are:-
s5_bg_top - 1500 x 269
s5_bg_bottom - 1500 x 800px
s5_bg - 234 x 207px
the s5_bg is only small therefore is set to repeat.... if you just want a small icon to show you might want to set the repeat to no in the template.css
if wanting your background to take up the entire screen adjust the sizing accordingly (the top and bottom sizes should help you work this out)
easy way is to unzip the template file, open the appropriate files in photoshop, make your changes, save (keep the same file name) , upload via ftp .