Can I use AS2 in Flash CS3?

Is it possible to use in Flash Cs3 the AS2 and not just AS3 ?
I am only trying to do a web link from a button to some web site…
I wrote

on (release) {
getURL ("
[COLOR=#0000ff]",[/COLOR]** “_blank”);
and nothing happen…some women here asked same question a month ago…people told her it is different from the AS2…still I cant used AS2 in falsh cs3 ?
or can I ?