i'm wondering if there's a code to put an image in the exact center of a screen both horizontally and vertically no matter the resolution? thanks!

Is it a background image, or a regular ol' image?

If it's the latter (which I'm assuming?), you could put it in a giant table and position it to the center of the cell, but that will center everything else on your page as well...

and set the cell width and height to 100%? Even so, how would it center vertically? and, can i put iframes on top of a table? because what i'm putting in the middle is an image on top of which will go iframes, kind of hard to describe.

you could set the table for <table align=center valign=center>

and then you could use div layers to put the iframe over it.