gistfile1.as

if (root.loaderInfo.parameters.clickTAG.substr(0,5) == "http:") {
  // Add more button instances here
  ClickHotspot.addEventListener( MouseEvent.CLICK, clickTagHandler);

  // If within a movie clip
  // movieClipInstanceName.buttonInstanceName.addEventListener(MouseEvent.CLICK, clickTagHandler);
}

function clickTagHandler(e:MouseEvent):void {
    navigateToURL(new URLRequest(root.loaderInfo.parameters.clickTAG), "_blank");
}