gistfile1.as

// declare your variable
var clickedItem:String;

// clickable_mc can obviously be the
// instance name of anything you want
// the user to click
clickable_mc.onRelease = function() {

  // set the variable to anything - this
  // will be grabbed in mc_omn and assigned
  // to the pageName param of the ActionSource
  // component - you can use this._name if your
  // clips are named sensibly, or grab a
  // string from an array
  clickedItem = "info_I_want_to_send_to_Omniture";

  // send mc_omn to frame 2, calls ActionSource
  mc_omn.gotoAndPlay(2);

  // all your other onRelease functionality,
  // getURLs or whatever goes here

};