function doNav(nID) {
	document.getElementById(nID).style.backgroundImage = "url(gfx/n_itembacka.jpg)";
	document.getElementById(nID).style.color = "#001a34";
}
function showPlane(pID) {
	document.getElementById(document.aID).style.display = "none";
	document.getElementById(pID).style.display = "block";
	document.aID=pID;
}
function showLayer(pID) {
	document.getElementById(pID).style.display = "block";
}
function hideLayer(pID) {
	document.getElementById(pID).style.display = "none";
}