Flash commands issue

Hi,

I am trying to navigate from a button inside a swf to the next page in my Lectora title... I can't for the life of me get it to work :(

I have "import flash.external" on frame 1 of my "actions" in the swf and the following snippet for my button:

on (release) {

ExternalInterface.call("trivNextPage()");

}

any suggestions on why it won't work?