function putActiveNav(index) {
	document.getElementById('nav_over_'+index).style.display = 'inline'; 
}

function removeActiveNav(index) {
	document.getElementById('nav_over_'+index).style.display = 'none'; 	
}

function putActiveSubNav(index) {
	document.getElementById('subnav_over_'+index).style.display = 'inline';
}

function removeActiveSubNav(index) {
	document.getElementById('subnav_over_'+index).style.display = 'none'; 	
}