function loop problem

function buildThumbs() {
        // voeg materiaal aan thumbs query toe
        if (!(materiaal === 'undefined')) {
            album += '&materiaal=' + materiaal;
        }
        current = 1;
        $('#imageWrapper').empty();
        $('#loading').show();
        $.get(baseurl + 'thumbs?album=' + album, function (data) {
            var countImages = getDataLength(data),
                count = 0,
                $tContainer = $('<div/>', {id: 'thumbsContainer', style: 'visibility:hidden;'}),
                thumb, // filling thumbswrapper here
                i = 0,
                $this;
            while (i < countImages) {
                if (countImages === 1) {
                    thumb = data;
                } else {
                    thumb = data[i];
                }
                $('<img  desc="' + thumb.desc + '" alt="' + thumb.alt + '" height="75" />').load(function () {
                    $this = $(this);
                    $tContainer.append($this);
                    count = count + 1;
                    if (count === 1) {
                        loadPhoto($this, "cursorPlus");
                    }
                    if (count === countImages) {
                        $('#thumbsWrapper').empty().append($tContainer);
                        thumbsDim($tContainer);
                        makeScrollable($('#thumbsWrapper'), $tContainer, 15);
                    }
                }).attr('src', thumb.src);
                i = i + 1;
            }
        }, 'json');
    }