function openNavDropdown(p) {
	var divs = document.getElementById("nav-bar").getElementsByTagName("div");
	for(i = 0; i < divs.length; i++) {
		if (divs[i].className == 'nav-dropdown' && divs[i].id != 'nav-dropdown-' + p) {
			divs[i].style.display = 'none';	
		}
	}
	var a = document.getElementById("nav-bar").getElementsByTagName("a");
	for(i = 0; i < a.length; i++) {
		if (a[i].className == 'top-nav-selected' && a[i].id != 'top-' + p) {
			a[i].className = 'top-nav-main';	
		}
	}
	if (document.getElementById("nav-dropdown-" + p)) document.getElementById("nav-dropdown-" + p).style.display = 'block';
	if (document.getElementById("top-" + p)) document.getElementById("top-" + p).className = 'top-nav-selected';
}