Need assistance: DFA Click Tag variable

Hi All,

I'm just attempting my first flash banner animation job for a client and just need some assistance in relation to a ClickTag

I have been researching all morning trying to work it out but it's time I reach out the the smarter ones out there

I've found many tutorials out there on adding a basic click tag but the issues is I have been provided by the client with the below code. (DFA Click Tag variable (Action Script 3))

Link_1.addEventListener(MouseEvent.MOUSE_UP, function(event: MouseEvent): void {
var sURL: String;
if ((sURL = root.loaderInfo.parameters.clickTag)) {
navigateToURL(new URLRequest(sURL), "_blank");
}
});

Can someone please explain how I am meant to properly implement this? It would be VERY much appreciated.
I won't be uploading the banner ( I believe it is going through the Google GDN)
So I assume I do not hard code in a link.

Thanks guys and girls.