try something like that:
sync on
hide mouse
make object cube 1,5
position camera 0,2,-10
load image "untitled.bmp",1
load image "untitled1.bmp",2
load image "untitled2.bmp",3
load image "untitled3.bmp",4
load image "untitled4.bmp",5
load image "untitled5.bmp",6
load image "untitled6.bmp",7
load image "untitled7.bmp",8
load image "untitled8.bmp",9
load image "untitled9.bmp",10
load image "untitled10.bmp",11
bmp = 1
do
yrotate object 1,wrapvalue(object angle y(1)+5)
zrotate object 1,wrapvalue(object angle z(1)+5)
if mouseclick()=1
texture object 1,bmp
inc bmp
if bmp = 12 then bmp = 1
endif
sync
loop
but maybe ur images are the problem... how big are they?
hope i helped
scout