function showSubNav()
{
	document.getElementById('topNavSecondaryContainer').style.visibility='visible';
}

function hideSubNav()
{
	document.getElementById('topNavSecondaryContainer').style.visibility='hidden';
}

function showManufacturerSubNav()
{
	document.getElementById('sideNavManufacturers').style.visibility='visible';
}

function hideManufacturerSubNav()
{
	document.getElementById('sideNavManufacturers').style.visibility='hidden';
	document.getElementById('manufacturersSideNavImage').src='assets/nav/manufacturers.gif';
}