If I have a relative style sheet:
<link rel="stylesheet" href="CSS/styleSheet1.css" type="text/css">

Is there anyway, through *client side code*, to change the entire reference
to another CSS?

I gave the link element an id and accessed it via getElementById to change it's HREF, but the result was problematic (buggy?). It would work repeatedly, except sometimes it would hang or leave certain CSS properties unchanged bewteen style sheets.