how to set image as background image to report

i want to set background image to report can any one tell how to set to whole report. i can set image to header, fotter, details, etc but cannot set for whole reportif you have CR XI, there are some examples of templates, one of the templates is a confidential underlay. That is a least one way to do this. also look for underlay following sections (in section expert) add your graphic to a page header, and select underlay following sections.|||Try this:
Insert another Page Header section (PHb), expand this new section that it would be the size of your page. Place your picture in the center of the PHb.
Then in the Section Expert, select the PHb section and check the "Underlay Following Sections".