function displaySubNav()
{
	document.getElementById('nav-drop').style.display = "block";
}

function hideSubNav()
{
	document.getElementById('nav-drop').style.display = "none"; 
}

function displaySubNav1()
{
	document.getElementById('nav-drop1').style.display = "block";
}

function hideSubNav1()
{
	document.getElementById('nav-drop1').style.display = "none"; 
}

function displaySubNav2()
{
	document.getElementById('nav-drop2').style.display = "block";
}

function hideSubNav2()
{
	document.getElementById('nav-drop2').style.display = "none"; 
}

function displaySubNav3()
{
	document.getElementById('nav-drop3').style.display = "block";
}

function hideSubNav3()
{
	document.getElementById('nav-drop3').style.display = "none"; 
}