removing an attached movieclip showing error??

[Nagikun]

Im using this code to attach a movieclip when mouse over and also on mouse out the movieclip shoud remove itself however this is not working

CODE:

s_talk.addEventListener(MouseEvent.MOUSE_OVER, attachMovieclip);
function attachMovieclip (e:MouseEvent):void {
var addtalk1:talk1 = new talk1();
addtalk1.x= 1120  
addtalk1.y= 0
this.addChild(addtalk1);
}
s_talk.addEventListener(MouseEvent.MOUSE_OUT, removeMovieclip);
function removeMovieclip (e:MouseEvent):void {
var addtalk1:talk1
removeChild(addtalk1);
}

When i test the flash and hover over the button the movie attachs correctly however when i mouse out nothing happens and the output section in adobe flash shows the error message:

TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/removeChild()
    at Untitled_fla::MainTimeline/removeMovieclip()

[rob day · Accepted solution]

try declaring the variable once outside of the functions:

var addtalk1:talk1 = new talk1();

s_talk.addEventListener(MouseEvent.MOUSE_OVER, attachMovieclip);
function attachMovieclip (e:MouseEvent):void {

addtalk1.x= 1120  
addtalk1.y= 0
addChild(addtalk1);
}
s_talk.addEventListener(MouseEvent.MOUSE_OUT, removeMovieclip);
function removeMovieclip (e:MouseEvent):void {
removeChild(addtalk1);
}

[Nagikun]

THANKS YOU THANK YOU

Works awesomely