How to change background
1) You should find out what is used asin your template. It is better to use code inspector (firebug for Firefox, native Chrome code inspector or Dragonfly for Opera). Right click on the you would like to change and select ‘Inspect element’ Find the styles which define the for the template. As the rule the image is used as the or combination of color and image.
2) To adjustimage you should edit PSD source file which is located in /sources/psd folder inside the main template folder. Open using Adobe Photoshop and adjust the to your needs. Then select the slice which is used for the and save it for web.
3) Then you should check where theimage is located. As the rule the image is located in/catalog/view/theme/themeXXX/image folder. Upload your newly created image to /catalog/view/theme/themeXXX/image folder and the image which is already there.
4) Also you may need to edit CSS file which is located in /catalog/view/theme/theme007/folder, the file name is .css