var activeExMenu = '';

function explodeMenu(menuName) {
    if (activeExMenu  != '' && activeExMenu != menuName)	{
			document.getElementById(activeExMenu).style.display = 'none'; 
		}
    if (document.getElementById(menuName).style.display != 'block') {
        document.getElementById(menuName).style.display = 'block';
				activeExMenu = menuName;
    } 
		else {
        document.getElementById(menuName).style.display = 'none';
    }
}