Dynamically total textbox and checkbox

[bird]

Greetings,

I'm trying to calculate the total on an php page. I'm able to get the
checkbox portion to work properly but I'm having trouble with the
textbox "txtshipping". The default is 7.95 but if changes I need to
change the total.

How can I make the totalbox the default of the textbox of
"txtshipping"?

I struggle with javascript so any help would be greatly appreciate.

Thanks in advance.
Bird

<script type="text/javascript">

function gettotal(){

var tmp = 0;
var nBox = document.getElementsByName('chkboxpackage[]');
for(i=1; i<nBox.length+1; i++)
{
if (nBox[i-1].checked)
{
tmp += parseFloat(document.forms[0]['hdnPackage'+i].value);

}
}

var nBox2 = document.getElementsByName('chkboxitem[]');
for(i=1; i<nBox2.length+1; i++)
{
if (nBox2[i-1].checked)
{
tmp += parseFloat(document.forms[0]['hdnItem'+i].value);

}
}

tmp += parseFloat(document.forms[0]['txtshipping'].value);
document.forms[0].totalbox.value = tmp.toFixed(2);
}

</script>

<input type="checkbox" name="chkboxpackage[]" value="1"
onClick="gettotal()">
<input type="hidden" name="hdnPackage1"
value="69.95" >

<input type="checkbox" name="chkboxpackage[]" value="2"
onClick="gettotal()">
<input type="hidden" name="hdnPackage2"
value="49.95" >
<input type="checkbox" name="chkboxpackage[]" value="3"
onClick="gettotal()">
<input type="hidden" name="hdnPackage3"
value="495.00" >
<input type="checkbox" name="chkboxitem[]" value="1"
onClick="gettotal()">
<input type="hidden" name="hdnItem1"
value="89.95" >
<input type="checkbox" name="chkboxitem[]" value="2"
onClick="gettotal()">
<input type="hidden" name="hdnItem2"
value="99.95" >
<input type="checkbox" name="chkboxitem[]" value="3"
onClick="gettotal()">
<input type="hidden" name="hdnItem3"
value="149.95" >
<input name="txtShipping" type="text" size="15"
onChange="gettotal()"></td>
<input type="text" name="totalbox"
value="0.00" readonly/>

[Jim Land]

"bird" <ma******@hughes.netwrote in
news:11*********************@p10g2000cwp.googlegro ups.com:

>
How can I make the totalbox the default of the textbox of
"txtshipping"?

?????? This doesn't make sense. Please explain in different words.

<input name="txtShipping" type="text" size="15"
onChange="gettotal()"></td>

?????? You want to calculate the total when the user changes the
shipping cost? Usually the user picks the shipping *method* and the
shipping cost is not in his control. For example, supposed I ordered
something large and heavy from you, and specified the shipping cost as
$1.00. That would be good for me, but bad for you. I suggest you re-
think this part.