function changeToOn(anId) {
	curImage = document.getElementById(anId);
	curImage.src = "img/" + anId + "_on.png";
}

function changeToOff(anId) {
	curImage = document.getElementById(anId);
	curImage.src = "img/" + anId + "_off.png";
}

function changeWorldTo(anId, worldImageName) {
	worldImage = document.getElementById('world');
	worldImage.src = "img/" + worldImageName + "_" + anId + ".gif";
}

function resetWorld(worldImageName) {
	worldImage = document.getElementById('world');
	worldImage.src = "img/" + worldImageName + ".gif";
}

function showInfo(divID) {
	if (document.getElementById(divID).style.display == 'none') {
		document.getElementById(divID).style.display = 'block';
	} else {
		document.getElementById(divID).style.display = 'none';
	}
}

var myimages = new Array();

function preloadimages() {
	for (i=0; i < preloadimages.arguments.length; i++) {
		myimages[i]=new Image()
		myimages[i].src=preloadimages.arguments[i]
	}
}