<script>
$(document).ready(function () {
$(document).scroll(function () {
// If has not activated (has no attribute "data-top"
if (!$('.subnavtest').attr('data-top')) {
// If already fixed, then do nothing
if ($('.subnavtest').hasClass('subnavtest-fixed')) return;
// Remember top position
var offset = $('.subnavtest').offset()
$('.subnavtest').attr('data-top', offset.top);
}
if ($('.subnavtest').attr('data-top') - $('.subnavtest').outerHeight() <= $(this).scrollTop())
$('.subnavtest').addClass('subnavtest-fixed');
else
$('.subnavtest').removeClass('subnavtest-fixed');
});
});
</script>