[jQuery] Help with safari :selected?

[Pantti]

Here is little script that works fine with IE and firefox, but not
with Safari(3.0.3 windows Beta):

var lasku_valittu = $("option#choise1:selected").length;
if( lasku_valittu >= 1){
  alert('finds!');
}

Problem with safari seems to be :selected. Without :selected script
works just fine, but i really need it.

Is there some other approach to make script work with safari also?