问如何检查镜像是否加载？

EN

            function load(){
                var imageUrls = [];
                imageUrls.push('http://www.nasa.gov/images/content/690106main_iss033e005644_full.jpg');
                imageUrls.push('http://www.nasa.gov/images/content/690669main_201209210010_full.jpg');
                imageUrls.push('http://www.nasa.gov/images/content/691806main_hs3_full_full.jpg');
                imageUrls.push('http://www.nasa.gov/images/content/689231main_Webb_Mirror_Cans_orig_full.jpg');
                var images = [];
                var i;
                var counter = 0;
                var mainDiv = document.getElementById('somediv');
                var counterDiv = document.getElementById('counter');

                for (i = 0; i < imageUrls.length; i++)
                {
                    images[i] = new Image();
                    images[i].width = 100;
                    images[i].height = 100;
                    images[i].onload = function () {
                        counter++;
                        counterDiv.innerText = counter;
                    }
                    mainDiv.appendChild(images[i]);
                    images[i].src = imageUrls[i];
                }
            }

var images;


$.each(images['images'], function(key, value) { 
 var load_image = new Image();

 load_image.src = ('index.php?load_image=' + value);

$('#image_count').remove();

$('span[class="loading"]').after('<div id="count"><h6>Images: ['+key+' / '+images_array['images'].length+']</h6></div>');
images+= '<li><a href="index.php?load_image='+value+'"><img src="index.php?load_image='+value+'" /></a></li>';

load_image.onload = function(){
    myPhotoSwipe.show(0);
}

});