Yes, resizing/repositioning stuff with IF statements (I mean rc If...Else...EndIf) should be tricky, and a hard-working tasks... Better use mzScript, but I can't give you example since I don't know exactly what you wanna do.
What do you mean about "static sized images" ?
Do you mean shortcut like - non resizable - images ?
In that case, my solution (there can be other, of course) is to make one image for each resolution, and call them:
Then, simply load them with something like:
Of course, it will give headaches to multimonitor users