<!--

var m_moz,m_ie;
var m_Pc = 46.0016;
var m_Tc = 190.6;
var m_Acentric = 0.0115;
var strURL;

function updatePlot()
//-------------------
{
	strURL = "zGraph/zgraph.aspx?width=500&height=300&backcolour=black&legendwidth=200";

	var bValid = true;
	var rVal;
	
	// Critical Pressure
	rVal = parseFloat(txtPcrit.value);
	
	if (isNaN(rVal))
	{
		txtPcrit.value = m_Pc;
		bValid = false
	}
	else if (rVal<=0.0)
	{
		txtPcrit.value = m_Pc;
		bValid = false
	}
	else
	{
		m_Pc = rVal;
		strURL = strURL + "&Pcrit=" + m_Pc;
	}
		
	// Critical Temperature
	rVal = parseFloat(txtTcrit.value);

	if (isNaN(rVal))
	{
		txtTcrit.value = m_Tc;
		bValid = false
	}
	else if (rVal<=0.0)
	{
		txtTcrit.value = m_Tc;
		bValid = false
	}
	else
	{
		m_Tc = rVal;
		strURL = strURL + "&Tcrit=" + m_Tc;
	}

	// Acentric
	rVal = parseFloat(txtAcentric.value);

	if (isNaN(rVal))
	{
		txtAcentric.value = m_Acentric;
		bValid = false
	}
	else if (rVal<=0.0)
	{
		txtAcentric.value = m_Acentric;
		bValid = false
	}
	else
	{
		m_Acentric = rVal;
		strURL = strURL + "&acentric=" + m_Acentric;
	}

	m_moz = (typeof(document.implementation) != 'undefined') && (typeof(document.implementation.createDocument) != 'undefined');
	m_ie = (typeof(window.ActiveXObject) != 'undefined'); 

	if (bValid)
	{
		if (m_ie)
			document.images("zPlot").src = strURL;
		else
			document.images["zPlot"].src = strURL;

	}	
}

-->