// JavaScript
/* Copyright Ray Beebe, 2008, All right reserved.*/
var called=false;	
var Tcst=0;
var Ftyp;
var efy;
var cbrn;
function calc(form){//document.forms['frmNavigation'].nav.options[document.forms['frmNavigation'].nav.selectedIndex].value
called=true;
//Fuel type
if (document.forms['Calculator'].Ftype[0].selected){
	Ftyp=29308;
}
 else if (document.forms['Calculator'].Ftype[1].selected){
	Ftyp =1000;	
}
else if (document.forms['Calculator'].Ftype[2].selected){
	Ftyp =714;
}
else if (document.forms['Calculator'].Ftype[3].selected){
	Ftyp =1098;
}
//Efficiency
if (document.forms['Calculator'].eff[0].selected){
	efy=1;
}
 else if (document.forms['Calculator'].eff[1].selected){
	efy =1.05;	
}
else if (document.forms['Calculator'].eff[2].selected){
	efy =1.1;
}
else if (document.forms['Calculator'].eff[3].selected){
	efy =1.15;
}
else if (document.forms['Calculator'].eff[4].selected){
	efy =1.2;
}
else if (document.forms['Calculator'].eff[5].selected){
	efy =1.25;
}
else if (document.forms['Calculator'].eff[6].selected){
	efy =1.3;
}
else if (document.forms['Calculator'].eff[7].selected){
	efy =1.4;
}
else if (document.forms['Calculator'].eff[8].selected){
	efy =1.7;
}
//Cost of Burner
if (document.forms['Calculator'].cburn[0].selected){
	cbrn=4000;
}
 else if (document.forms['Calculator'].cburn[1].selected){
	cbrn =5000;	
}
else if (document.forms['Calculator'].cburn[2].selected){
	cbrn =6000;
}
else if (document.forms['Calculator'].cburn[3].selected){
	cbrn =7000;
}
else if (document.forms['Calculator'].cburn[4].selected){
	cbrn =8000;
}
else if (document.forms['Calculator'].cburn[5].selected){
	cbrn =9000;
}
else if (document.forms['Calculator'].cburn[6].selected){
	cbrn =10000;
}
else if (document.forms['Calculator'].cburn[7].selected){
	cbrn =11000;
}
else if (document.forms['Calculator'].cburn[8].selected){
	cbrn =12000;
}
else if (document.forms['Calculator'].cburn[9].selected){
	cbrn =13000;
}
else if (document.forms['Calculator'].cburn[10].selected){
	cbrn =14000;
}
else if (document.forms['Calculator'].cburn[11].selected){
	cbrn =15000;
}
else if (document.forms['Calculator'].cburn[12].selected){
	cbrn =16000;
}
else if (document.forms['Calculator'].cburn[13].selected){
	cbrn =17000;
}
else if (document.forms['Calculator'].cburn[14].selected){
	cbrn =18000;
}



if(isNaN(document.forms['Calculator'].Uval.value))
		{document.forms['Calculator'].Uval.value = "Enter Valid #";
		document.forms['Calculator'].Tcst.value="NA";
		document.forms['Calculator'].pbck.value="NA";
		}
	else
{Tcst=Math.round(Ftyp * document.forms['Calculator'].Uval.value * efy);
document.forms['Calculator'].Tcst.value=" $ "+ Tcst;
var y = cbrn/Tcst
y=roundNumber(y,1);
document.forms['Calculator'].pbck.value=y +"  Years";
}
}
function roundNumber(num, decp)
{
var r = Math.round(num*Math.pow(10,decp))/Math.pow(10,decp);
return r;
}