what programs to create themes for Nokia ? yes i will use photoshop first .?

[samra]

what program to create themes for Nokia ?
.....

i will use photoshop first ...
for images and stuff ...

but what program to make the theme it self ?...

and what the screen size resolutions for most nokia's ?...
so i make serveral themes...
and what other images sizes there are ?..
like icons and stuff ?

also what the most popular nokia ? so i make theme for it ?...