checkbox value invert problems

[gvimercati]

hello, im a newy to this forum... and to javascript for that matter, my situation is...:

i have 20 or checkboxes in a form, the form Posts to itself because it needs server side validation, i need to make sure that if the checkbox is ticked and the form is submitted, the value of the checkbox changes b4 the submission... the way i am doing this is with am onChange='Invert(this.name);'

function Invert(inputName)
{
//doco below doesn't output the number... only the string
doco = "document.form."+inputName+".value";

if (doco== 1)
doco= 0;
else
doco= 1;
}

im trying to reuse the code as much as possible or else i know that i could simply write 20 if statements... there has to be a reusable way... can someone shed some light...

in simpler terms, i need 'doco' to give the value not the string..

im open to all suggestions.. or if there is another way of doing this... i'm all ears

thanks for the patience...

[Fang]

If you want to uncheck all checkboxes before submission do it like this:

function Invert(obj) {
for(var i=0; i<obj.length; i++) {
if(obj.elements[i].checked==true) {
obj.elements[i].checked=false;
}
}
obj.submit();
}
.
.
<form action="NextPage.html" method="post" name="myform" onsubmit="Invert(this); return false;">
<input type="checkbox" value="box1" />
<input type="checkbox" value="box2" />
<input type="checkbox" value="box3" />
<button type="submit">submit</button>
</form>