css:
a {
    behaviour: url('http://example.com/sneak.htc');
}

sneak.htc:
<PUBLIC:ATTACH EVENT="onmouseover" ONEVENT="DoHover()" />
function DoHover() {
    // JavaScript statements...
}
[download]

But! that could just be cheating the provider and should not be lightly undertaken, and if they have a clue, they may block offsite CSS as well (ah, and offsite images.. ) .

--shmem

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}