<script
language="javascript"
type="text/javascript">
function
checkChoice(whichbox)
{
with
(whichbox.form)
{
if
(whichbox.checked
==
false)
hiddentotal.value
=
eval(hiddentotal.value)
-
eval(whichbox.value);
else
hiddentotal.value
=
eval(hiddentotal.value)
+
eval(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);
}
</script>
<table>
<tr>
<td>
<form
name=myform>
<pre>
<b>Example
1</b>
Steak $15.25
<input
type=checkbox
name=Steak
value="15.25"
onClick="this.form.total.value=checkChoice(this);">
Chicken $12.39
<input
type=checkbox
name=Chicken
value="12.39"
onClick="this.form.total.value=checkChoice(this);">
Sushi $18.75
<input
type=checkbox
name=Sushi
value="18.75"
onClick="this.form.total.value=checkChoice(this);">
<br>
Your total is:
<input
type="text"
name="total"
value=""
size=6
readonly><input
type=hidden
name=hiddentotal
value=0>
</pre>
</form>
<hr
width="100%"
noshsde>
<form
name=myform2>
<pre>
<b>Example
2</b>
Tea $ .50
<input
type=checkbox
name=Tea
value=".50"
onClick="this.form.total.value=checkChoice(this);">
Cola $ .79
<input
type=checkbox
name=Cola
value=".79"
onClick="this.form.total.value=checkChoice(this);">
Coffee $ 1.75
<input
type=checkbox
name=Coffee
value="1.75"
onClick="this.form.total.value=checkChoice(this);">
<br>
Your total is:
<input
type="text"
name="total"
value=""
size=6
readonly><input
type=hidden
name=hiddentotal
value=0>
</pre>
</form>
</td>
</tr>
</table>
