cropping the panel

Hi, I created a panel from a cockpit photo, I croped the parts on the outside leaving just the cockpit, but still, in fs2004 I can't see outside, it only appears whyte!how can I cut this so that only the actual panel is loaded? 

I was just testing,, but I need to know how can I cut the whyte parts!!
thks


I was just testing,, but I need to know how can I cut the whyte parts!!
thks