function reveal(menu) {
	if (menu == "tech") {
		document.getElementById("submenu_tech").style.visibility="visible";
		document.getElementById("clearsubmenu_tech").style.visibility="visible";
	}
	if (menu == "products") {
		document.getElementById("submenu_products").style.visibility="visible";
		document.getElementById("clearsubmenu_products").style.visibility="visible";
	}
		if (menu == "about") {
		document.getElementById("submenu_about").style.visibility="visible";
		document.getElementById("clearsubmenu_about").style.visibility="visible";
	}
}

function hide() {
	document.getElementById("submenu_tech").style.visibility="hidden";
	document.getElementById("clearsubmenu_tech").style.visibility="hidden";
	document.getElementById("submenu_products").style.visibility="hidden";
	document.getElementById("clearsubmenu_products").style.visibility="hidden";
	document.getElementById("submenu_about").style.visibility="hidden";
	document.getElementById("clearsubmenu_about").style.visibility="hidden";
}