function jumpBox(list) {
   location.href = list.options[list.selectedIndex].value
   }

function computeForm(form) {

var i = form.interest.value;

    if (i > 1.0) {

        i = i / 100.0;

        form.interest.value = i;

    }

     i /= 12;


   var prin1 = eval(form.principal.value);

   var prin2 = eval(form.principal.value);

   var pmt1 = form.origPmt.value;

   var pmt2 = eval(form.origPmt.value) + eval(form.pmtAdd.value);

   var prinPort1 = 0;

   var prinPort2 = 0;

   var intPort1 = 0;

   var intPort2 = 0;

   var count1 = 0;

   var count2 = 0;
    
   while(prin1 > 0) {
                    intPort1 = eval(i * prin1);
                    prinPort1 = eval(pmt1 - intPort1);
                    prin1 = eval(prin1 - prinPort1);
                    count1 = count1 + 1
                    if(count1 > 600) { break; } else { continue;}
                    }

   while(prin2 > 0) {
                    intPort2 = eval(i * prin2);
                    prinPort2 = eval(pmt2 - intPort2);
                    prin2 = eval(prin2 - prinPort2);
                    count2 = count2 + 1
                    if(count2 > 600) { break; } else { continue;}
                    }

      form.intSave.value = (count1 * pmt1) - (count2 * pmt2);
      form.roi.value = (form.intSave.value / (count2 * form.pmtAdd.value)) / (count2 / 12);

     var timSave = (count1 - count2);

      form.results.value = ("If you add $" + form.pmtAdd.value + " to your monthly payment, you will pay off this debt in " + count2 + " payments instead of " + count1 + ", and you will save $" + parseInt(form.intSave.value,10) + " in interest charges.  This savings translates into a guaranteed, tax-free, average annual return of " + parseInt(form.roi.value * 100,10) + "%.  And pay off this debt " + timSave + "-months (" + parseInt(timSave /12,10) + " years, " + (timSave %12) + " months) ahead of schedule!");
}



function clearForm(form)

{

    form.principal.value = "";

    form.interest.value = "";

    form.origPmt.value = "";

    form.pmtAdd.value = "";

    form.intSave.value = "";

    form.roi.value = "";

    form.results.value = "";
}