Dynamic image set on mobile does not worl

I've this jquery code to set an image dynamicly.

$.when(bigImg.src = "images/sample_pictures/" + currentDay + ".jpg").done(function(){
        setTimeout(
            function(){

                if($(".contentWrapper").ierWidth() < bigImg.width){
                    $.when(bigImg.width = $(".contentWrapper").ierWidth() - 10).done(function(){
                        $.when($("#bigImgDiv").css("visibility","visible")).done(function() {
                            $("#bigImgHeader").html(currentDay.split("_").pop() + ". " + december);
                            $("#bigImgImage").html('');
                            $.when($("#bigImgImage").append(bigImg)).done(function () {
                                $("#presentWrapper").toggle('fold', 3000);
                            });
                        });
                    });
                }else{
                    $.when($("#bigImgDiv").css("visibility","visible")).done(function() {
                        $("#bigImgHeader").html(currentDay.split("_").pop() + ". " + december);
                        $("#bigImgImage").html('');
                        $("#bigImgImage").append(bigImg);
                    }).then($("#presentWrapper").toggle('fold', 3000));
                }
            }, 500);
    });

I add the image in this div

<div id="day_21" class="door_small_closed nailthumb-container_day_21" >
    <div id="day_21_numDiv"  class="numberDoorClosed">21</div>
</div>

This works fine on Firefox an IE, but not on Chrome and Safari.

Firefoy and IE render the img like I expect it

<img src="/images/sample_pictures/day_21.jpg" title="21. Dezember" alt="21. Dezember">

but Chrome does it this way

<img alt="21. Dezember" title="21. Dezember" src="/images/sample_pictures/door_small_closed nailthumb-container_day_21.jpg">

Any ideas?