//drop down code



function menuOpen(menuID) {
   var menu = document.getElementById(menuID);
   menu.style.visibility="visible";
}
function menuClose(menuID) {
   var menu = document.getElementById(menuID);
   menu.style.visibility="hidden";
}

function navBkgChange(btnID) {
	var btnIDVar = document.getElementById(btnID);
	btnIDVar.style.backgroundImage = 'url(_images/nav_bkg_white.gif)';		
}
function navBkgChangeBack(btnID) {
	var btnIDVar = document.getElementById(btnID);
	btnIDVar.style.backgroundImage = '';		
}