cript,
танцы с бубнами ...
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function ()
{
$('#form input:checkbox:not(":checked")').addClass('check').prop({checked : true});
var nochecks = $('.check').serialize();
$('.check').removeClass('check').prop({checked : false});
alert(nochecks)
})
</script>
</head>
<body>
<form id="form">
<input type="checkbox" name="ky" value="1" checked>
<input type="checkbox" name="test" value="1">
<input type="checkbox" name="ky" value="1" checked>
</form>
<div onclick="update();"></div>
</body>
</html>