ActionScript 3.0 :: Play Again & Email Button - 1120 Error

1. I am trying to write script for a Play Again button. I keep getting an 1120 error with the following code:

playAgainButton.addEventListener(MouseEvent.CLICK, startLoop);
function startLoop (evtobj:MouseEvent):void{
}

On stage I have a button named playAgainButton

2. I am trying to have a button that allows a user to click to e-mail someone. I get an 1120, 1119 and 1180 errors with the following code:

var emailLink: String = "mailto:johndoe@ourcompany.com";
mailtoLink.addEventListener(MouseEvent.CLICK,funct ion():void {
navigateToURL(new URLRequest(emailLink), "_blank");}