function changeNav(value) { document.getElementById("subNavExist").style.display= "block"; }

function showSub(subsection) { document.getElementById(subsection).style.display= "block"; }

function checkExpand(divsub) {
	var mainHeader = location.href;
		expand(divsub);
}

function hideSub(subnav) {
	document.getElementById(subnav).style.display="none";

}

function expand(divsub)
{
   var subnav = document.getElementById(divsub);
   subnav.style.visibility = "visible";
   subnav.style.display = "block";
}

function collapse(divsub)
{
   var subnav = document.getElementById(divsub);
   subnav.style.visibility = "hidden";
   subnav.style.display = "none";
}

function checkCollapse(divsub)
{
   var mainHeader = location.href;
	   var subnav = document.getElementById(divsub);
	   subnav.style.visibility = "hidden";
	   subnav.style.display = "none";
}