animated images mate
im tired so expect mistakes, on ft.com somewhere theres a post called "rawlis car falshing" or something like. scroll down and theres a like like good tutorials or something (if i remember rightly you need to change the .co.uk to .com???)
anyway, on that link theres lots of anim stuff
to make an animation i tend to start with say 2 images
1 could be you car, and 2nd could be your car with lights turned on. bring up the first image and click on the button on the bottom of the toolbox (called go to photo-something or other) its a button the whole width of the toolbox and right near the bottom (i really am tires)
then in the program that just opened up should be your no.1 image, go window>animation if the animation box isnt already up
in the animation box there should be a button that says "duplicate current frame or something. click it and there will be a 2nd frame in the animation box. go back to photoshop and highlight, then copy your 2nd image (lights on), then go back to the other program, with the animation box, select frame 2 (should still be selected) and hit Ctrl+V
now fram 1 should be pic 1 and frame 2 should be pic 2
if you press the play button (bottom of anim box) it should flick between the 2 real fast.
you can have the effect of 1 merging into the other by cliking the tweed button (5dots in bottom row of anim box), select about 20 in the no. of frames box and press tweed or ok or woteva.
if you just want it 2 change from 1 to 2, then stay on 2 then change back to 1 i think you just need to adjust the times on the bottom of each frame.
after work 2moro mate i will write this properly for ya...
sorry if its a mess