Loader class help

Im using:
ActionScript Code:
//
var myLoader:Loader = new Loader(); addChild(myLoader);
var url:URLRequest = new URLRequest(“contact_form.swf”);
myLoader.load(url);
To load an SWF. I have set it so it loads when i click on my contact button the swf is a contact(form) and it loads fine. However when i click on any of the other navigation buttons the contact form is still there.

Here is my as
ActionScript Code:
//
stop();
btn1_btn.addEventListener(MouseEvent.CLICK,showimage1);
function showimage1(event:MouseEvent):void {
gotoAndPlay(“label1”);
}
btn2_btn.addEventListener(MouseEvent.CLICK, showimage2);
function showimage2(event:MouseEvent):void {
gotoAndPlay(“label2”);
}
btn3_btn.addEventListener(MouseEvent.CLICK, showimage3);
function showimage3(event:MouseEvent):void {
gotoAndPlay(“label3”);
}
btn4_btn.addEventListener(MouseEvent.CLICK, showimage4);
function showimage4(event:MouseEvent):void {
gotoAndPlay(“label4”);
}
btn5_btn.addEventListener(MouseEvent.CLICK, showimage5);
function showimage5(event:MouseEvent):void {
gotoAndPlay(“label5”);
}
btn6_btn.addEventListener(MouseEvent.CLICK, showimage6);
function showimage6(event:MouseEvent):void {
gotoAndPlay(“label6”);
}
btn_7.addEventListener(MouseEvent.CLICK, clickFunction);

function clickFunction(evt:MouseEvent):void {
gotoAndPlay(“label6”);
}

import fl.video.VideoEvent;
lightbulb.autoRewind = true; // fl_video being the name of the video component
lightbulb.addEventListener(VideoEvent.AUTO_REWOUND, doLoop);
lb.autoRewind = true; // fl_video being the name of the video component
lb.addEventListener(VideoEvent.AUTO_REWOUND, doLoop);
function doLoop(e:VideoEvent):void
{
e.target.play();
}
Many thanks in advance