function initTable()
{
	ew = document.getElementById("emptyWeight");
	ewa =
	    document.getElementById("emptyWeightArm");
	ewm =
	    document.getElementById("emptyWeightMom");
	g =
	    document.getElementById("gallonsFuel");
	fw =
	    document.getElementById("fuelWeight");
	fwa =
	    document.getElementById("fuelWeightArm");
	fwm =
	    document.getElementById("fuelWeightMom");
	pw =
	    document.getElementById("pilotWeight");
	pwa =
	    document.getElementById("pilotWeightArm");
	pwm =
	    document.getElementById("pilotWeightMom");
	rw =
	    document.getElementById("rearPassWeight");
	rwa =
	    document.getElementById("rearPassWeightArm");
	rwm =
	    document.getElementById("rearPassWeightMom");
	b1w =
	    document.getElementById("baggage1Weight");
	b1wa =
	    document.getElementById("baggage1WeightArm");
	b1wm =
	    document.getElementById("baggage1WeightMom");
	b2w =
	    document.getElementById("baggage2Weight");
	b2wa =
	    document.getElementById("baggage2WeightArm");
	b2wm =
	    document.getElementById("baggage2WeightMom");
	gw =
	    document.getElementById("grossWeight");
	cg =
	    document.getElementById("centerOfGravity");
	gm =
	    document.getElementById("grossMom");
	pEngine = document.getElementById("piston");
	tEngine = document.getElementById("turbine");
	fw.disabled=true;
	ewm.disabled=true;
	fwm.disabled=true;
	pwm.disabled=true;
	rwm.disabled=true;
	b1wm.disabled=true;
	b2wm.disabled=true;
	gm.disabled=true;
	gw.disabled=true;
	cg.disabled=true;
}

function pistonSelect()
{
	fw.disabled=true;
	g.disabled=false;
	fw.className = "noedit";
	g.className = "contact";
}

function turbineSelect()
{
	g.value="";
	g.disabled=true;
	fw.disabled=false;
	g.className="noedit";
	fw.className="contact";
	
}

function calculate()
{

	if (fw.disabled == true)
	{
		fw.value = (g.value * 6);
	}
	
	if (g.disabled == true)
	{
		g.value = "";
	}
	
	
	
	
	ewm.value = (ew.value * ewa.value);
	
	fwm.value = (fw.value * fwa.value);
	pwm.value = (pw.value * pwa.value);
	rwm.value = (rw.value * rwa.value);
	b1wm.value = (b1w.value * b1wa.value);
	b2wm.value = (b2w.value * b2wa.value);
	gw.value = (parseFloat(ew.value) + parseFloat(fw.value) +
	            parseFloat(pw.value) + parseFloat(rw.value) + parseFloat(b1w.value) +
	            parseFloat(b2w.value));
	gm.value = Math.round(parseFloat(ewm.value) +
	                      parseFloat(fwm.value) + parseFloat(pwm.value) + parseFloat(rwm.value) +
	                      parseFloat(b1wm.value) + parseFloat(b2wm.value));
	cg.value =
	    Math.round((parseFloat(gm.value / gw.value)*10)/10);
}

function clearWBValues()

{
	ew.value=0;
	ewa.value=0;
	ewm.value=0;
	g.value=0;
	fw.value=0;
	fwa.value=0;
	fwm.value=0;
	pw.value=0;
	pwa.value=0;
	pwm.value=0;
	rw.value=0;
	rwa.value=0;
	rwm.value=0;
	b1w.value=0;
	b1wa.value=0;
	b1wm.value=0;
	b2w.value=0;
	b2wa.value=0;
	b2wm.value=0;
	gw.value=0;
	cg.value=0;
	gm.value=0;
	
}