>Hi,
>I've got a form with a load of checkboxes on it and I want to submit a value which will depend on the selections made in the checkboxes.
>I've written a javascript function to change the value of a hidden input box. The value of that input box will be submitted.
>
>Trouble is it's always undefined.
>In my javascript function I've got
>document.nameofdocument.nameofinputbox.value=="3"
>If I do
>alert(document.nameofdocument.nameofinputbox.value) from within the function it gives a message saying 3.
>
>But when I submit the form the value is undefined.
>
>Has anyone got any idea what is going wrong here please?

The deal with checkboxes is always logical. So, assigning a value won't work. So, basically, if you wish to plug in true, you need to do something like document.nameofdocument.nameofinputbox.checked=true.