gistfile1.txt

function load_image(evt) {
         if (!(window.File && window.FileReader && window.FileList && window.Blob)) {
            alert("FileReader API not supported by this browser ...");
            return;
         }

         var file = evt.target.files[0];
         if (!file.type.match("image.*")) {
            alert("This is not an image file! :(");
            return;
         }

         var reader = new FileReader();
         reader.onload = (function(file) {
            return function(e) {
               alert("File read!");
               texture_.old_img = texture_.image;

               texture_.image = new Image();

               texture_.image.onload = function() {
                  if (texture_.image.width > 0 && texture_.image.height > 0) {
                     try {
                        set_image(texture_.image);
                     } catch (e) {
                        texture_.image = texture_.old_img;
                        alert(e);
                     }
                  } else {
                     texture_.image = texture_.old_img;
                  }
               }
               texture_.image.src = e.target.result;
            }
         })(file);

         reader.readAsDataURL(file);
      }