Good Practices

use strict:

function getYaddaYadda() {
        "use strict";
         //Function goes here
}

When writing native JavaScript, it is good practice to declare strict mode which forces you to write cleaner more semantic code

Ancient Browser

You might want to make your script entirely invisible to really old browsers

<!--

function funky(){

alert("monkey");

}

//-->

<form>

<input type="button" value="push" onclick="funky()">

</form>