function overview() {
		document.getElementById('overview').style.display = "block";
		document.getElementById('features').style.display = "none";
		document.getElementById('accessories').style.display = "none";
}
function features() {
		document.getElementById('overview').style.display = "none";
		document.getElementById('features').style.display = "block";
		document.getElementById('accessories').style.display = "none";
}
function accessories() {
		document.getElementById('overview').style.display = "none";
		document.getElementById('features').style.display = "none";
		document.getElementById('accessories').style.display = "block";
}