if (req.readyState == 4 && req.status == 200)
         {
             var res = req.responseText;
-            if (res == "Error")
+
+            // if response starts with "Error" then show a failure
+            if (/^Error/.test(res))
             {
-                pop_failure ();
+                pop_failure (res);
                 return;
             }
+
             res = res.split ("\n");
             if (time != 'none')
             {
         if (req.readyState == 4 && req.status == 200)
         {
             var res = req.responseText;
-            if (res == "Error")
+
+            if (/^Error/.test(res))
             {
-                pop_failure ();
+                pop_failure (res);
                 return;
             }
+
             res = res.split ("\n");
             async_global_ref = res[0];
             var code = res[1];
         if (req.readyState == 4 && req.status == 200)
         {
             var res = req.responseText;
-            if (res == "Error")
+
+            if (/^Error/.test(res))
             {
-                pop_failure ();
+                pop_failure (res);
                 return;
             }
+
             res = res.split ("\n");
             var code = res[0]
             async_global_transfered = async_global_transfering;
         if (req.readyState == 4 && req.status == 200)
         {
             var res = req.responseText;
-            if (res == "Error")
+
+            if (/^Error/.test(res))
             {
-                pop_failure ();
+                pop_failure (res);
                 return;
             }
+
             res = res.split ("\n");
             if (async_global_time != 'none')
             {