// Drop Down Menu
var tab = 0;
var subtab = 0;
var menu = new Array("about","events","birding","journal","records","contact");
var submenu = new Array("funds","COBirds","county","photos","lists","forms","seasonal");

// expand() makes selected layer taller (height property)
function expandTab(id){
	tab=document.getElementById(id);
	tab.style.visibility='visible';
}

// contract() makes selected layer shorter (height property)
function contractTab(){
	if(tab){
		tab.style.visibility = 'hidden';
	}
	if(subtab){
		subtab.style.visibility = 'hidden';
	}
}

function expandSubTab(id){
	subtab=document.getElementById(id);
	subtab.style.visibility='visible';
}

function contractSubTab(id){
	subtab=document.getElementById(id);
	subtab.style.visibility='hidden';
}

function closeAll(){
	var i=0;
	for(i=0; i<menu.length; i++) {						
		tab = document.getElementById(menu[i]);
		tab.style.visibility = "hidden";
	}
	var i=0;
	for(i=0; i<submenu.length; i++) {						
		tab = document.getElementById(submenu[i]);
		tab.style.visibility = "hidden";
	}
}