function showHide(id,action){
	var v = document.getElementById(id);
	if (action == 'show'){
		// v.style.display = 'block'
		v.style.visibility = 'visible'
	}else if (action == 'hide'){
		// v.style.display = 'none'
		v.style.visibility = 'hidden'
	}
	return true;
}

function showHideMenu(menuID,action){
	
	hideMenus();
	
	if (action == 'hide') {
		return true;
	}else if (action == 'show') {
		showHide(menuID,'show');
	}
}

function hideMenus() {
	showHide('menu1','hide');
	showHide('menu2','hide');
	showHide('menu3','hide');
	showHide('menu4','hide');
}