function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}


if (document.images) {
navRoll_r01_c1_F1 = new Image(172,26); navRoll_r01_c1_F1.src = "image/navRoll_r01_c1.gif";
navRoll_r01_c1_F2 = new Image(172,26); navRoll_r01_c1_F2.src = "image/navRoll_r01_c1_F2.gif";
navRoll_r03_c1_F1 = new Image(172,27); navRoll_r03_c1_F1.src = "image/navRoll_r03_c1.gif";
navRoll_r03_c1_F2 = new Image(172,27); navRoll_r03_c1_F2.src = "image/navRoll_r03_c1_F2.gif";
navRoll_r04_c1_F1 = new Image(172,26); navRoll_r04_c1_F1.src = "image/navRoll_r04_c1.gif";
navRoll_r04_c1_F2 = new Image(172,26); navRoll_r04_c1_F2.src = "image/navRoll_r04_c1_F2.gif";
navRoll_r05_c1_F1 = new Image(172,27); navRoll_r05_c1_F1.src = "image/navRoll_r05_c1.gif";
navRoll_r05_c1_F2 = new Image(172,27); navRoll_r05_c1_F2.src = "image/navRoll_r05_c1_F2.gif";
navRoll_r06_c1_F1 = new Image(172,26); navRoll_r06_c1_F1.src = "image/navRoll_r06_c1.gif";
navRoll_r06_c1_F2 = new Image(172,26); navRoll_r06_c1_F2.src = "image/navRoll_r06_c1_F2.gif";
navRoll_r08_c1_F1 = new Image(172,27); navRoll_r08_c1_F1.src = "image/navRoll_r08_c1.gif";
navRoll_r08_c1_F2 = new Image(172,27); navRoll_r08_c1_F2.src = "image/navRoll_r08_c1_F2.gif";
}

/* Function that swaps images. */

function di20(id, newSrc) {
    var theImage = FWFindImage(document, id, 0);
    if (theImage) {
        theImage.src = newSrc;
    }
}

/* Functions that track and set toggle group button states. */

function FWFindImage(doc, name, j) {
    var theImage = false;
    if (doc.images) {
        theImage = doc.images[name];
    }
    if (theImage) {
        return theImage;
    }
    if (doc.layers) {
        for (j = 0; j < doc.layers.length; j++) {
            theImage = FWFindImage(doc.layers[j].document, name, 0);
            if (theImage) {
                return (theImage);
            }
        }
    }
    return (false);
}

function checkNumber(input, min, max, msg) {
msg = msg + " field has invalid data: " + input.value;
var str = input.value;
for (var i = 0; i < str.length; i++) {
var ch = str.substring(i, i + 1)
if ((ch < "0" || "9" < ch) && ch != '.') {
alert(msg);
return false;
      }
   }
var num = parseFloat(str)
if (num < min || max < num) {
alert(msg + " not in range [" + min + ".." + max + "]");
return false;
   }
input.value = str;
return true;
}
function computeField(input) {
if (input.value != null && input.value.length != 0)
input.value = "" + eval(input.value);
computeForm(input.form);
}
function computeForm(form) {
if ((form.payments.value == null || form.payments.value.length == 0) ||
(form.interest.value == null || form.interest.value.length == 0) ||
(form.principal.value == null || form.principal.value.length == 0)) {
return;
}
if (!checkNumber(form.payments, 1, 480, "# of payments") ||
!checkNumber(form.interest, .001, 99, "Interest") ||
!checkNumber(form.principal, 100, 10000000, "Principal")) {
form.payment.value = "Invalid";
return;
}
var i = form.interest.value;
if (i > 1.0) {
i = i / 100.0;
form.interest.value = i;
}
i /= 12;
var pow = 1;
for (var j = 0; j < form.payments.value; j++)
pow = pow * (1 + i);
money = "" + .01* Math.round(100*(form.principal.value * pow * i) / (pow - 1));
dec = money.indexOf(".");
dollars = money.substring(0,dec); 
cents = money.substring(dec+1,dec+3);
cents = (cents.length < 2) ? cents + "0" : cents;
money = dollars + "." + cents;
form.payment.value = money;
}
function clearForm(form) {
form.payments.value = "";
form.interest.value = "";
form.principal.value = "";
}