<script>
$(document).ready(function() {
    $('.section').each(function() {
        var imgurl = $(this).find('img').attr('src');
        $(this).html('').css({
            'width' : '100%',
            'heihgt' : '600px',
            'background-image' : 'url(' + imgurl + ')',
            'background-position' : '50% 50%',
            'background-size' : 'cover',
            'background-repeat' : 'no-repeat'
        });
    });
});
</script>