var popups = new Array("home","articles","websites","images","downloads","links","about","contact");
function showNav(index) {
var thisPopup = document.getElementById('nav_'+popups[index]+'_popup');
if(thisPopup!=null){
thisPopup.style.visibility = 'visible';
}
}
function hideNav(index) {
var thisPopup = document.getElementById('nav_'+popups[index]+'_popup');
if(thisPopup!=null){
thisPopup.style.visibility = 'hidden';
}
}