var bio = new Image();
bio.src = 'images/menu/bio.gif';
var bio_over = new Image();
bio_over.src = 'images/menu/bio_over.gif';

var signup = new Image();
signup.src = 'images/menu/signup.gif';
var signup_over = new Image();
signup_over.src = 'images/menu/signup_over.gif';

var samples = new Image();
samples.src = 'images/menu/samples.gif';
var samples_over = new Image();
samples_over.src = 'images/menu/samples_over.gif';

var contact = new Image();
contact.src = 'images/menu/contact.gif';
var contact_over = new Image();
contact_over.src = 'images/menu/contact_over.gif';

var home = new Image();
home.src = 'images/menu/home.gif';
var home_over = new Image();
home_over.src = 'images/menu/home_over.gif';

function planerOver(planet_name) {
	var planet = document.getElementById(planet_name);
	switch(planet_name) {
		case "bio":
			planet.src = bio_over.src;
		break;
		case "signup":
			planet.src = signup_over.src;
		break;
		case "samples":
			planet.src = samples_over.src;
		break;
		case "contact":
			planet.src = contact_over.src;
		break;
		case "home":
			planet.src = home_over.src;
		break;
	}
}

function planetOut(planet_name) {
	var planet = document.getElementById(planet_name);
	switch(planet_name) {
		case "bio":
			planet.src = bio.src;
		break;
		case "signup":
			planet.src = signup.src;
		break;
		case "samples":
			planet.src = samples.src;
		break;
		case "contact":
			planet.src = contact.src;
		break;
		case "home":
			planet.src = home.src;
		break;
	}
}