function test_it(entry) {
 if (entry.value!=null && entry.value.length!=0) {
  entry.value=""+ eval(entry.value);
  }
 computeForm(entry.form);
}

function computeForm(form) {
 if ((form.months.value==null || form.months.value.length==0) ||
    (form.rate.value==null || form.rate.value.length==0) ||
    (form.financed.value == null || form.financed.value.length==0)) {
   return;
 }

 if (!alrt_msg(form.months,1,480,"Your Number of Payments") ||
    !alrt_msg(form.rate,.001,99,"Your Interest Rate") ||
    !alrt_msg(form.financed,100,10000000,"Your Principal Amount")) {
   form.payment.value="A value out of range";
  return;
 }

 var i=form.rate.value;
 ffv=0;
 ffv+=form.financed.value;
 fmv=0;
 var g="";
 if (form.DurationType.value=='Monthly') {
	 g=form.months.value;
 } else {
     var dr=form.months.value;
     g=dr*12.0;
 }
 fmv+=g;
 if (i >= 1.0) {
  // Hack to mostly correct floating point/binary conversion error
  i=(i/100.0)+.00001;
  var fmt="";
  fmt+=i;
  fmt=fmt.substring(0,6)
  //form.rate.value=fmt;
 }

 i/=12;

 var isn=1;

 for (var j=0;j<g;j++)
  isn=isn*(1+i);
  form.payment.value=(form.financed.value*isn*i)/(isn-1);
  fpv=0;
  fpv+=form.payment.value;
  var fmt="";
  var add=9;
  fmt+=form.payment.value;

  for (var i=0;i<fmt.length;i++) {
   if (fmt.charAt(i)==".") {
     add=i+3;
     i=fmt.length;
    }
  }

  fmt=fmt.substring(0,add);
  fcalc=((fmv*fpv)-ffv);

  var fmtb="";
  var add=9;

  fmtb+=fcalc;

  for (var i=0;i<fmtb.length;i++) {
   if (fmtb.charAt(i)==".") {
     add=i+3;
     i=fmtb.length;
   }
  }

  fmtb=fmtb.substring(0,add);
  //form.payment.value="   $"+fmt+"              $"+fmtb;
  form.payment.value=fmt;
}

function reset_it(form) {
 form.months.value="";
 form.rate.value="";
 form.financed.value="";
 form.payment.value="";
}

function alrt_msg(entry,low,high,prompt) {
 prompt="You couldn't know. "+prompt 
 +" entry has unacceptable stuff: "+entry.value;
 
 var scratch=entry.value;

 for (var i=0;i<scratch.length;i++) {
  var letter=scratch.substring(i,i+1);
  if ((letter<"0" || "9"<letter) && letter!='.') {
   alert(prompt);
   return false;
  }
 }

 var errtst=parseFloat(scratch)

 if (errtst<low || high<errtst) {
  alert("I'm sorry. "+prompt+ " is not in the range"
  +" from "+low+" to "+high+"!");
  return false;
 }

 entry.value=scratch;

 return true;

}

function calculate(f) 
{
alert('hello');
}


function change(f,a) {
 //f.Box[0].checked
 //f.Box[1].checked
}