function computeSum(form)
{
var a = parseFloat(form.Rent.value, 10) + parseFloat(form.Car.value, 10) + parseFloat(form.College.value, 10) + parseFloat(form.OtherLoans.value, 10) + parseFloat(form.Insurance.value, 10);

var b = parseFloat(form.Groceries.value, 10) + parseFloat(form.EatingOut.value, 10) + parseFloat(form.Gasoline.value, 10) + parseFloat(form.Clothing.value, 10);

var c = parseFloat(form.Gas.value, 10) + parseFloat(form.Water.value, 10) + parseFloat(form.Phone.value, 10) + parseFloat(form.Electric.value, 10) +
parseFloat(form.Cable.value, 10);

var d = parseFloat(form.Habits.value, 10) + parseFloat(form.CellPhone.value, 10) + parseFloat(form.Entertainment.value, 10) + parseFloat(form.Medical.value, 10);

var e = parseFloat(form.Other.value,10) + parseFloat(form.Hidden.value,10); 

form.TotalIncome.value = parseFloat(form.RegularIncome.value,10) + parseFloat(form.OtherIncome.value,10);
form.TotalExpenses.value = a + b + c + d + e; 
form.MonthlyTotal.value = form.TotalIncome.value - form.TotalExpenses.value;
}