calculating totals with select boxes!??

[joelmoss]

Could someone please help me. I am desperate to get this working.

I am trying to create a calculator that can calculate the total cost of something using select menus. I have managed to do it with one item, no problem, but when it comes to calculating multiple items in one form, I get errors all over the place.

Here is an example of what I need; http://allaccessdomains.com/allaccess.html

Take a look at the select boxes at the bottom of the page and mess about with them and you will see what I mean. Feel free to mess with the source code aswell.

As I said it works fine with just one select box and one item, but not with multiple.

I would appreciate it greatly if someone could help me out here.

Thanks,

[moospot]

If you view the source code, its all there.

Good Luck

<SCRIPT language=JavaScript>
<!-- Begin
function checkChoice(whichbox) {
with (whichbox.form) {
if (isNaN(whichbox.value)) {
whichbox.value = whichbox.priorval;
whichbox.focus();
}
whichbox.value = Math.abs(whichbox.value);
var dec = whichbox.value.indexOf('.', 1)
if (dec > 0) {
alert('No decimal places allowed for \"' +whichbox.name +'\" !');
whichbox.value = whichbox.priorval;
whichbox.focus();
}
hiddentotal.value = eval(hiddentotal.value) - eval(whichbox.price * whichbox.priorval);
whichbox.priorval = whichbox.value;
hiddentotal.value = eval(hiddentotal.value) + eval(whichbox.price * whichbox.value);
return(formatCurrency(hiddentotal.value));
}
}
function formatCurrency(num) {
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(num)) num = "0";
cents = Math.floor((num * 100 + 0.5) % 100);
num = Math.floor((num * 100 + 0.5) / 100).toString();
if(cents < 10) cents = "0" + cents;
for (var i = 0; i < Math.floor((num.length - (1 + i)) / 3); i++)
num = num.substring(0,num.length - (4 * i + 3))+','+num.substring(num.length-(4 * i + 3));
return ("$" + num + "." + cents);
}
function InitForm() {
//document.myform.total.value = '$0';
//document.myform.hiddentotal.value = 0;
for (xx = 0; xx < document.myform.elements.length; xx++) {
if (document.myform.elements[xx].type == 'text') {
document.myform.elements[xx].value = 0;
}
}
}
// End -->
</SCRIPT>