Two skins, one link

Question

Hi.
I am creating a web site with two different skins, first for 56kbs speeds (it almost does not have any style), second for fast internet speed (with css styles and perhaps ajax).
How can I use one page for both of them? I mean when I click on corresponding hyperlink in two sites(skins), I go to one page with corresponding skin. (I build one page and then assign skin to it)

Thanks