change img to div with background-image (for covered thumbnails)

cover image from image tag

    $('img.tocover').each(function(i, elem) {
        var img = $(elem);
        var div = $("<div />").css({
            "background": "url(" + img.attr("src") + ") no-repeat",
            "background-size": "cover",
            "width": "150px",
            "height": "150px",
            "margin": "5px"
        })

        img.replaceWith(div);
    });