Loading and Unloading external SWFs

programming flash
1

Ok i am needing some more help again.

I have a button that i want to use to load an external SWF dynamically. Here is my current code for it (below).

The first problem is I’m getting error 1120: Access of undefined property contact_btn.
And yes my instance name of the button is contact_btn in the property table.
So i don’t know what it is that is causing it?

I also am clueless of how to get this clip to unload from the screen when the user clicks a button, and show the original screen the user saw before he clicked on the contact button to load the contact form.
Or do i just use the same theory of loading the contact form, to load over the contact form that loaded over the main page when he clicked the contact button … sorry if this is getting confusing.

Any ideas?
I need this for a big project that i must have completed in a week.
Help is appreciated and thanked in advance!


stop();
    
// Import classes
import flash.net.URLRequest;
import flash.events.*;
import flash.display.Loader;

function contact(event:MouseEvent):void {
    var contactRequest:URLRequest = new URLRequest("contact.swf");
    var contactLoader:Loader = new Loader();
    contactLoader.load(contactRequest);
    addChild(contactLoader);
    contactLoader.x = 0;
    contactLoader.y = 0;
}

contact_btn.addEventListener(MouseEvent.CLICK, contact);