// The TrackTag variable refers to the location of the
// base action tag. In the actual implementation this 
// action tag will point to a 1x1 pixel GIF.

var TrackTag = 'http://switch.atdmt.com/action/';

function GetActionTag(URL){ 
  document.action_tag.src = TrackTag + URL;

// The URL passed from the SWF will be appended to TrackTag.
// The image will be loaded into the img src tags below the 
// Flash ad's OBJECT tag.
}