Codecademy and Eclipse Incompatible?

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So I've been trying out Codecademy in my spare time and I'm quite confused as to why the accepted output in Codecademy refuses to work in Eclipse.

var legalDrivingAge = 18;
var canIDrive = function (myAge) {
	if (myAge >= legalDrivingAge) {
		return true;
	} else {
		return false;}
};

canIDrive(prompt("Age?"));/CODE]

Also, Eclipse doesn't accept console.log, function, and prompt but Codecademy uses them. Why doesn't it work in Eclipse? When I was making a new class in Eclipse it gave me a warning that use of the default package is discouraged, however that is the only package I have available. What should I be using?

FWIW I'm on OS X 10.8.2.

EDIT: Nevermind it was just a situation of Java vs Javascript.