I have no idea what script language you would use or if it is even possible

But heres what I want to do:

I want to have a master page with a lot of other pages identical to it, apart from some text and a bit of code.

Can I make it so that when I edit the master page - (eg: the colours etc) all of the pages based of it get changed as well.

Thanks.

PS sorry if this is in wrong forum.