I want to change hidden input value on div click, so i do following:

$('#gallery').click(function(){
        if ($('input[name=isgallery]').attr('value') == '0') {
            $('input[name=isgallery]').attr('value', '1')
        }
        else {
            $('input[name=isgallery]').attr('value', '0')
        }
        $('#filterform').attr('action',$('#filterform').attr('act'));
        alert('ok');
        $('#filterform').submit();
    }
    );

when it equals 0 i change it to 1 and otherwise but it did not work and following code works:

$('#gallery').click(function(){
        if ($('input[name=isgallery]').attr('value') == '0') {
            $('input[name=isgallery]').attr('value', '0')
        }
        else {
            $('input[name=isgallery]').attr('value', '1')
        }
        $('#filterform').attr('action',$('#filterform').attr('act'));
        alert('ok');
        $('#filterform').submit();
    }
    );

and also, when i delete the function at all it still works and form submits

maybe i have one more handler for this div, but i can't find one

you can check it on http://www.4block.org/en/museum/posters and click "gallery view" on top-right