var mynav;
var topnav;
var subnav = 'bar';

function treeOpen(navLevel){
mynav = navLevel;

if (mynav != topnav){
mynav.className = 'open';
topnav.className = 'closed';
topnav = navLevel;

} else {
mynav.className = 'closed';
topnav = 'foo';
		}

}

function treeClose(){
if (topnav != 'foo')
{
topnav.className = 'closed';
}
}


function youAreHere(topLevel){

mynav = document.getElementById(topLevel);
mynav.className = 'open';


topnav = mynav;

}