the jquery hover()
takes in two functions: in and out events...
so modify your code like so:
<script>
$('.vraagteken_container').hover(function() {
$('.vraagteken_container').hide('slide', {direction: 'right'}, 1000);
},
function() {
$('.vraagteken_container').show('slide', {direction: 'left'}, 1000);
});
</script>