function doShowHide(popupMenu)
{

/* This function launches when the visitor moves the mouse over the nav-bar choices. It receives the ID of the corresponding menu and makes this menu visible while hiding the others.*/

if (popupMenu == "AboutUsMenu") 
	{
	document.getElementById("AboutUsMenu").style.visibility="visible";
	document.getElementById("menu2").style.visibility="hidden";
	document.getElementById("menu3").style.visibility="hidden";
	document.getElementById("menu4").style.visibility="hidden";
	document.getElementById("menu5").style.visibility="hidden";
	document.getElementById("menu6").style.visibility="hidden";
	document.getElementById("menu7").style.visibility="hidden";
	}

if (popupMenu == "menu2") 
	{
	document.getElementById("menu1").style.visibility="hidden";
	document.getElementById("menu2").style.visibility="visible";
	document.getElementById("menu3").style.visibility="hidden";
	document.getElementById("menu4").style.visibility="hidden";
	document.getElementById("menu5").style.visibility="hidden";
	document.getElementById("menu6").style.visibility="hidden";
	document.getElementById("menu7").style.visibility="hidden";
	}
if (popupMenu == "menu3") 
	{
	document.getElementById("menu1").style.visibility="hidden";
	document.getElementById("menu2").style.visibility="hidden";
	document.getElementById("menu3").style.visibility="visible";
	document.getElementById("menu4").style.visibility="hidden";
	document.getElementById("menu5").style.visibility="hidden";
	document.getElementById("menu6").style.visibility="hidden";
	document.getElementById("menu7").style.visibility="hidden";
	}
if (popupMenu == "menu4") 
	{
	document.getElementById("menu1").style.visibility="hidden";
	document.getElementById("menu2").style.visibility="hidden";
	document.getElementById("menu3").style.visibility="hidden";
	document.getElementById("menu4").style.visibility="visible";
	document.getElementById("menu5").style.visibility="hidden";
	document.getElementById("menu6").style.visibility="hidden";
	document.getElementById("menu7").style.visibility="hidden";
	}
if (popupMenu == "menu5") 
	{
	document.getElementById("menu1").style.visibility="hidden";
	document.getElementById("menu2").style.visibility="hidden";
	document.getElementById("menu3").style.visibility="hidden";
	document.getElementById("menu4").style.visibility="hidden";
	document.getElementById("menu5").style.visibility="visible";
	document.getElementById("menu6").style.visibility="hidden";
	document.getElementById("menu7").style.visibility="hidden";
	}
if (popupMenu == "menu6") 
	{
	document.getElementById("menu1").style.visibility="hidden";
	document.getElementById("menu2").style.visibility="hidden";
	document.getElementById("menu3").style.visibility="hidden";
	document.getElementById("menu4").style.visibility="hidden";
	document.getElementById("menu5").style.visibility="hidden";
	document.getElementById("menu6").style.visibility="visible";
	document.getElementById("menu7").style.visibility="hidden";
	}
if (popupMenu == "menu7") 
	{
	document.getElementById("menu1").style.visibility="hidden";
	document.getElementById("menu2").style.visibility="hidden";
	document.getElementById("menu3").style.visibility="hidden";
	document.getElementById("menu4").style.visibility="hidden";
	document.getElementById("menu5").style.visibility="hidden";
	document.getElementById("menu6").style.visibility="hidden";
	document.getElementById("menu7").style.visibility="visible";
	}
}

function doHide(popupMenu)
{
/* This Function launches when the visitor clicks the close button at the bottom of the menu. It receives the ID of the current menu and then hides that  menu*/

document.getElementById(popupMenu),style,visibility=" hidden";
}