function imgOn(imgName)
{
	if(document.images)
	{
		document[imgName].src = eval(imgName + "On.src");
	}
}

function imgOff(imgName)
{
	if(document.images)
	{
		document[imgName].src = eval(imgName + "Off.src");
	}
}


function showLayer(layerName)
{
	if(document.all) // IE
	{
		document.all[layerName].style.visibility = 'visible';
	}
	else if(document.layers) // NS
	{ 
 		document.layers[layerName].visibility = 'visible';
	}
	else // DOM
	{
		document.getElementById(layerName).style.visibility = 'visible';
	}
}

function hideLayer(layerName)
{
	if(document.all) // IE
	{
		document.all[layerName].style.visibility = 'hidden';
	}
	else if(document.layers) // NS
	{
		document.layers[layerName].visibility = 'hidden';
	}
	else // DOM
	{
		document.getElementById(layerName).style.visibility = 'hidden';
	}
}


programOn = new Image(); programOn.src = "images/nav/index_program_on.gif";
programOff = new Image(); programOff.src = "images/nav/index_program_off.gif";
admissionOn = new Image(); admissionOn.src = "images/nav/index_admission_on.gif";
admissionOff = new Image(); admissionOff.src = "images/nav/index_admission_off.gif";
facultyOn = new Image(); facultyOn.src = "images/nav/index_faculty_on.gif";
facultyOff = new Image(); facultyOff.src = "images/nav/index_faculty_off.gif";
alumniOn = new Image(); alumniOn.src = "images/nav/index_alumni_on.gif";
alumniOff = new Image(); alumniOff.src = "images/nav/index_alumni_off.gif";
academicOn = new Image(); academicOn.src = "images/nav/index_academic_on.gif";
academicOff = new Image(); academicOff.src = "images/nav/index_academic_off.gif";
studentOn = new Image(); studentOn.src = "images/nav/index_student_on.gif";
studentOff = new Image(); studentOff.src = "images/nav/index_student_off.gif";

var blnReset = false;

function showtopnav(menuname)
{
	resettopnav();
	showLayer(menuname+'Menu');
	showLayer('topNavReset');
	blnReset = false;
}
function resettopnav()
{
	hideLayer('programMenu');
	hideLayer('admissionMenu');
	hideLayer('facultyMenu');
	hideLayer('alumniMenu');
	hideLayer('academicMenu');
	hideLayer('studentMenu');
	hideLayer('topNavReset');
	blnReset = false;
}

/*
//Drop each of the subnavs down 2px if N6:
if(navigator.appName == "Netscape" && !document.layers)
{
        n6subnavDrop('programMenu');
        n6subnavDrop('admissionMenu');
        n6subnavDrop('facultyMenu');
        n6subnavDrop('alumniMenu');
        n6subnavDrop('academicMenu');
        n6subnavDrop('studentMenu');
}
function n6subnavDrop(layername)
{
        document.getElementById(layername).style.top = "35px";
}
*/