(bash shell) Gnome-panel-screenshot without confirmation box

I wrote a simple bash shell script to open a program (from bash), run some commands, printscreen the results, close the program and repeat the cicle 20/30 times. Before the script this task took me aprox. 40/60 minutes to do, now it takes 15 minutes, but i have to be stuck on the monitor to press save every time a screenshot is taken.

Can i, some how, overpass this box confirmation? Important thing, i cannot install any other program to take the screenshot, since i'm using software from the company, so i'm stuck with gnome-panel-screenshot (Solaris 10 - GNU bash version 3.2.57).

Sorry for my English, btw!