This is what my stylesheet_header_menu.css looks like:

body {
behavior: url(http://www.mysitehere.com/csshover.htc), url(http://mysitehere.com/csshover1.htc);
}

This fixes the functionality of the sites when entered either way - but both site come up with an error. It's just a start, maybe someone could add an if else statement to this somehow or an OR kinda thing. I'm not a coder but i feel like this is possible.