Modify BOOT Image

I recently acquired the Asus P5QL Pro motherboard to build an arcade machine. What I want is modify the bios to remove the intel logo and the "Press TAB to access POST Message…". To have a clean interface. With the ASUS MyLogo program I successfully changed the image, but the intel logo and te message are still there. How can I remove them? In which format are stored BIOS Images?

Thank you very much!