diff --git a/apple2js.html b/apple2js.html
index 423bf4a..acb3074 100644
--- a/apple2js.html
+++ b/apple2js.html
@@ -199,7 +199,7 @@ function openManage() {
     $("#manage").dialog("open");
 }
 
-function loadHTTP(url, cb) {
+function loadHTTP(url) {
     loading = true;
     $("#loading").dialog("open");
 
@@ -215,9 +215,6 @@ function loadHTTP(url, cb) {
             $("#disklabel" + _saveDrive).text(name);
             $("#loading").dialog("close");
             loading = false;
-            if (cb) {
-                cb();
-            }
         }
     }
     req.send(null);
diff --git a/apple2jse.html b/apple2jse.html
index 387afcb..ae0e941 100644
--- a/apple2jse.html
+++ b/apple2jse.html
@@ -203,7 +203,7 @@ function openManage() {
     $("#manage").dialog("open");
 }
 
-function loadHTTP(url, cb) {
+function loadHTTP(url) {
     loading = true;
     $("#loading").dialog("open");
 
@@ -219,9 +219,6 @@ function loadHTTP(url, cb) {
             $("#disklabel" + _saveDrive).text(name);
             $("#loading").dialog("close");
             loading = false;
-            if (cb) {
-                cb();
-            }
         }
     }
     req.send(null);
diff --git a/js/disk2.js b/js/disk2.js
index d498400..b0bb912 100644
--- a/js/disk2.js
+++ b/js/disk2.js
@@ -720,6 +720,38 @@ function DiskII(io, callbacks, slot)
             if (fmt === "do") {
                 fmt = "dsk";
             }
+            _cur.readOnly = false;
+            if (fmt === "2mg") {
+                // Standard header size is 64 bytes. Make assumptions.
+                var prefix = new Uint8Array(data.slice(0, 64));
+                var data = data.slice(64);
+                
+                // Check image format.
+                // Sure, it's really 64 bits. But only 2 are actually used.
+                switch (prefix[0xc]) {
+                case 0:
+                    fmt = "dsk";
+                    break;
+                case 1:
+                    fmt = "po";
+                    break;
+                case 2:
+                    fmt = "nib";
+                    break;
+                default:  // Something hinky, assume "dsk"
+                    fmt = "dsk";
+                    break;
+                }
+                var flags = 
+                    prefix[0x10] | (prefix[0x11] << 8) |
+                    (prefix[0x12] << 16) | (prefix[0x13] << 24);
+                _cur.readOnly = (flags & 0x80000000) ? true : false;
+                if (flags & 0x10) {
+                    _cur.volume = flags & 0xff;
+                } else {
+                    _cur.volume = 254;
+                }
+            }
             for (var t = 0; t < 35; t++) {
                 var track, off, d;
                 if (fmt === "nib") {