var act=null;
function showSubMenu(x) {
	if (act!=null) {
		hideSubMenu(act);
	};
	if (act!=x) {
		var el=document.getElementById("tr-" + x);
		if (el) {
		var ax=document.getElementById("a-" + x);
ax.className="selectedmenu";
			el.style.display="block";
act=x;
		};

	} else {
		act=null;
	};
};
function hideSubMenu(x) {
	var el=document.getElementById("tr-" + x);
	if (el) {
		var ax=document.getElementById("a-" + x);
ax.className="menu-link";
		el.style.display="none";
	};
};

if (document.getElementById){ 
document.write('<style type="text/css">\n')
document.write('.submenu{display: none;}\n')
document.write('</style>\n')
}

function SwitchMenu(x, obj){
	if(document.getElementById && obj != null){

	var b = (x.id == "mainMenuexp") ? true : false;

	var ar = document.getElementById("leftnav").getElementsByTagName("div");
	for (var i=0; i<ar.length; i++){
		if (ar[i].id=="mainMenuexp") 
			ar[i].id="mainMenu";
	}

	x.id = (b) ? "mainMenu" : "mainMenuexp";
	
	var el = document.getElementById(obj);
	ar = document.getElementById("leftnav").getElementsByTagName("span"); 
		if(el.style.display != "block"){ 
			for (var i=0; i<ar.length; i++){
				if (ar[i].className=="submenu") 
				ar[i].style.display = "none";
			}
			el.style.display = "block";
		}else{
			el.style.display = "none";
		}
	}
}