function openSubmenu(submenuID, mainmenuID) {
	var subm = document.getElementById(submenuID);

	if (currentMainmenu != 'none') {
		var cmmenu = document.getElementById(currentMainmenu);
		if (cmmenu) {
			cls.remove(cmmenu, 'active');
		}
	}

	if (currentSubmenu != 'none') {
		var currentsubm = document.getElementById(currentSubmenu);
		if (currentsubm) {
			currentsubm.style.display = 'none';
		}
	}

	var mmenu = document.getElementById(mainmenuID);
	if (mmenu) {
		cls.add(mmenu, 'active');
	}

	if (subm) {
		subm.style.display = 'block';
	}

	return true;
} // End of openSubmenu

function closeSubmenu(submenuID, mainmenuID) {
	var subm = document.getElementById(submenuID);

	if (subm) {
		subm.style.display = 'none';
	}

	if (currentMainmenu != 'none') {
		var cmmenu = document.getElementById(currentMainmenu);
		if (cmmenu) {
			cls.add(cmmenu, 'active');
		}
	}

	if (currentMainmenu != mainmenuID) {
		var mmenu = document.getElementById(mainmenuID);
		if (mmenu) {
			cls.remove(mmenu, 'active');
		}
	}

	if (currentSubmenu != 'none') {
		var currentsubm = document.getElementById(currentSubmenu);
		if (currentsubm) {
			currentsubm.style.display = 'block';
		}
	}

	return true;
} // End of closeSubmenu