var activeSub = 0;

function showSubmenu(id) {
	var submenu = Ext.get('submenu-' + id);
	
	hideSubmenu(activeSub);
	
	submenu.setDisplayed('block');
	
	activeSub = id;
}

function hideSubmenu(id) {
	var submenu = Ext.get('submenu-' + id);
	
	if(submenu) {
		submenu.setDisplayed('none');
	}
}