function init()
{
	ns4 = (document.layers)? true:false;
	ie4 = (document.all)? true:false;
	rest = (document.getElementById)? true:false;
	if (ns4||ie4||rest)
	{
		spectrum = new DynLayer ("spectrumDiv");
		optimum = new DynLayer ("optimumDiv");
		yough = new DynLayer ("youghDiv");
		armstrong = new DynLayer ("armstrongDiv");
		kokomo = new DynLayer ("kokomoDiv");
		bullseye = new DynLayer ("bullseyeDiv");
		wissmach = new DynLayer ("wissmachDiv");
		sgs = new DynLayer ("sgsDiv");
		chicago = new DynLayer ("chicagoDiv");
	}
}

var olddiv="start";

function displaydiv(currentdiv)
{
		
	if (ns4 || ie4 || rest)
	{
		if (olddiv != "start") olddiv.hide();
		
		currentdiv.show();
		olddiv = eval(currentdiv);
		return false;
	}
	else
	{
		return true;
	}
}

function hidediv(currentdiv)
{
	if (ns4 || ie4 || rest)
	{
		currentdiv.hide();
		return false;
	}
	else 
	{
		return true;
	}
}