function getDiscountPrice5(units) {
// Note: It is important to work your way down from max to min amounts!
if (units <= 0) return 0;
}
function getNumberOfUnits5() {
var units = eval(document.calculator.respons4.value) + eval(document.calculator.respons3.value) + eval(document.calculator.respons2.value) + eval(document.calculator.respons1.value) + eval(document.calculator.respons.value);
return (units == "") ? 0 : units;
}
function showResult5(result) {
// adjust the following line if result must popup somewhere else
document.calculator.respons5.value = result;	
}
function formatMessage5(units) {
return formatPrice5(units);
}

function findPrice5() {
var units = getNumberOfUnits5();
var result = formatMessage5(units); 
showResult5(result);
}
function formatPrice5(value) {
var result= Math.floor(value) + ".";
var cents = 100 * (value-Math.floor(value)) + 0.5;
result += Math.floor(cents / 10);
result += Math.floor(cents % 10);
return result;
}
function filterNonNumeric5(field) {
var result = new String();
var numbers = "0123456789";
var chars = field.value.split(""); // create array 
for (i = 0; i < chars.length; i++) {
if (numbers.indexOf(chars[i]) != -1) result += chars[i];
}
if (field.value != result) field.value = result;
}