Need a little help with this

Hi;

l am a little stuck on gathering all the results and adding them together. I have tried different ways to get them but had no luck.
Each of these variable has the total of each drop down menu. Now I trying to gather each drop down menu then add them to get a
the total of everhing.

the variable that hole the total of each drop down menu.

stotal
dtotal
ctotal
ptotal

Code:

<script type="text/javascript">
function ServiceItemSelected(){
var stotalselected;
var select;
var sitem ;
var stotal;
select = document.forms['FrontPage_Form1'].elements['Service'];
sitem = select.options[select.selectedIndex].text
switch (sitem){

case "Choose one":
alert("You have made a wrong selection")
break;
case "Internet Digi":
stotal= 4 * 0.4;
//alert(stotal.toFixed(2))

break;
case "Internet Vid":
stotal= 3 * 0.4;
//alert(stotal.toFixed(2))

break;
case "Internet Only":
stotal= 2 * 0.4;
//alert(stotal)

break;
case "Digital":
stotal= 2 * 0.4;
//alert(stotal)

break;
case "B2":
stotal= 1 * 0.4;
//alert(stotal)

break;
case "B1":
stotal= 0 * 0.4;
//alert(total)

break;
default:
stotal= 0 * 0.4;
//alert(total)

break;


}

}

function DurationItemSelected(){
var dselect;
var ditem;
var dtotal;
dselect = document.getElementById("Duration")
ditem = dselect.options[dselect.selectedIndex].text
switch (ditem){

case "Choose one":
alert("You have made a wrong selection")
break;
case "Three or more years":
dtotal= 4 * 0.2;
//alert(dtotal.toFixed(2))
break;
case "One to two years":
dtotal= 2 * 0.2;
//alert(dtotal.toFixed(2))
break;
case "Less than a year":
dtotal= 1 * 0.2;
//alert(dtotal.toFixed(2))
break;
default:
dtotal= 0 * 0.2;
//alert(dtotal.toFixed(2))
break;

return dtotal;

}

}

function DelinquentItemSelected(){
var cselect;
var citem;
var ctotal;
cselect = document.getElementById("Delinquent")
citem = cselect.options[cselect.selectedIndex].text
switch (citem){

case "Choose one":
alert("You have made a wrong selection")
break;
case "0":
ctotal= 4 * 0.3;
//alert(ctotal.toFixed(2))
break;
case "1 - 3":
ctotal= 2 * 0.3;
//alert(ctotal.toFixed(2))
break;
case "4 - 6":
ctotal= 0 * 0.3;
//alert(ctotal.toFixed(2))
break;
default:
ctotal= 0 * 0.3;
//alert(ctotal.toFixed(2))
break;

return ctotal;
}

}

function PromosItemSelected(){
var pselect;
var pitem;
var ptotal;
pselect = document.getElementById("Promos")
pitem = pselect.options[pselect.selectedIndex].text
switch (pitem){

case "Choose one":
alert("You have made a wrong selection")
break;
case "No Promo":
ptotal= 4 * 0.1;
//alert(ptotal.toFixed(2))
break;
case "Promo within one year":
ptotal= 2 * 0.1;
//alert(ptotal.toFixed(2))
break;
case "Promo within 6 months":
ptotal= 1 * 0.1;
//alert(ptotal.toFixed(2))
break;
default:
ptotal= 0 * 0.1;
//alert(ctotal.toFixed(2))
break;

return ptotal;

}
}

This where I am having the problem. I don't how to pass the results of each drop down to get the total. I know it's wrong! However how can I fix it?

function SumSelected(stotal, dtotal, ctotal, ptotal){

var TotalSumSelected = stotal + dtotal + ctotal + ptotal;

alert(TotalSumSelected.toFixed(2))
}

</script></p>

you have to call it like this:
SumSelected(ServiceItemSelected(), DurationItemSelected(), DelinquentItemSelected(), PromosItemSelected());

Thank you for taking the time to help. I am a little unclear on something correct me if I am wrong SumSelected is a variable right? I did the the following changes and I got this error.

function grandtotal(){
SumSelected(ServiceItemSelected(), DurationItemSelected(), DelinquentItemSelected(), PromosItemSelected());
Line: 612
var SumSelected = stotal + dtotal + ctotal + ptotal;

alert(SumSelected.toFixed(2))
}

The error I got is this
Line: 612
Char: 1
error: Object expected

no, SumSelected is a function.
you need only to call it and the function contains code that doing the job you want.
you can't refer to stotal, dtotal, ctotal and ptotal as those are variables inside different functions.

You have to excuse me I am new to javascript! Here what I did and I got a diferent error
function SumSelected(ServiceItemSelected(), DurationItemSelected(), DelinquentItemSelected(), PromosItemSelected())
{
line: 610
char: 41
error: '}'
var total= ServiceItemSelected + DurationItemSelected + DelinquentItemSelected + PromosItemSelected;
alert(total.toFixed(2))
}

no.
have such code in your page:

and have the function as you posted it here. that's all...