I have this tiny little javascript:

function buildselect() {
parent.center.dpreply.drop.options[0] = new Option('- - - Categories - - -', '');
parent.center.dpreply.drop.options[1] = new Option('asd', '1');
parent.center.dpreply.drop.options[2] = new Option('testing 2', '2');
}
which is in one frame and I call it from another frame to fill a select menu using:

window.top.topbar2.buildselect();

In IE6 this works fine, in NS6 nothing is displayed. What am I doing wrong?