var timerId;

function showMenu(menu) {
	doHideMenus(false);
	clearTimeout(timerId);
	document.getElementById("SecondLevelNav").style.visibility = "visible";
	document.getElementById(menu).style.visibility = "visible";
}
function hideMenu(menu) {
	timerId = setTimeout("doHideMenus(true)", 750);
}
function doHideMenus(showSub) {
	document.getElementById("SecondLevelNav").style.visibility = "hidden";
	document.getElementById("m_aboutus_sub").style.visibility = "hidden";
	document.getElementById("m_ourfacility_sub").style.visibility = "hidden";
	document.getElementById("m_forestmanagement_sub").style.visibility = "hidden";
	document.getElementById("m_contact_sub").style.visibility = "hidden";
	
	if(currentSection != null && showSub) { showMenu(currentSection + "_sub"); }
}