Whoah Lizard... That's... That's.. I'd like to play that.

Me too, hopefully it will get actually get finished.

Don't worry it will

Does anyone know how to make parallax scrolling animations? I know you need several layers, all moving at different speeds, but what program or how do I get an image to scroll sideways?

An example of parallax scrolling (not mine)

You move the closest layer three pixels right per frame
The second layer two pixels
The third one pixel
etc

Do this until you have reached a number of frames sufficient to loop all the images to the starting position

Flash will automate this all for you but much prefers vectors to bitmaps and isn't very good at saving bitmaps nicely
Any other program like GIMP will make you do all the moving by hand but it is easier to export a nicer looking result using graphics not drawn in-program

Unless you're more specific I can't really help you more than that

Thanks for the compliments!

That's an awesome looking game Lizard, it's a sidescrolling platformer/shooter?

Actually in that particular image there are three layers, the static background, the middle layer and the closest layer, which is travelling at exactly twice the speed of the middle layer, meaning there are far fewer frames required to loop it (one lap of the middle layer).

I was talking in general rather than that image in specific
Obviously the speed and number of layers isn't going to be the same every time

Maybe so roast but it doesn't look too good ingame.

the more pixels per frame the movement is the choppier it looks, until you have to increase the framerate at which point it looks nicer but you have to make twice as many frames

But that would take like 300 frames for a 100x300 size image, that's awful tedious to move each layer over a few pixels.

Welcome to animating
You can probably move more than 3 pixels at a time for a 300 pixel image though, just remember that the more pixels per second you are moving, the choppier the animation will be

Ideally you'd move the background seperate from the framecount and together with how the camera's moving according to "solid ground".

Instead of animating all frames manually you could simply code it to move the layers accordingly as well as repeating them when needed, that is assuming you're talking about parallax backgrounds in games.