Vertically Centering Elements with offset (jQuery)

center-vertically.js

/*
usage:
call function: centerThings();
add class: "center-vert"
add offset (optional): data-center-offset="-3"
example: <div class="center-vert" data-center-offset="-3">text</div>
demo: http://jsfiddle.net/adamculpepper/kns0osky
*/

function centerThings() {
    $(".center-vert").each(function () {
        var el = $(this);
        var targetHeight = el.outerHeight();
        var parentHeight = el.parent().outerHeight();
        var targetCenter = (parentHeight / 2) - (targetHeight / 2);
        var targetOffset = (el.attr("data-center-offset")) ? el.attr("data-center-offset") : 0;
        var targetTotal = (targetCenter + parseInt(targetOffset));

        el.css({
            'position': 'relative',
            'top':  targetTotal
        });
    });
}