Index: engine.js
===================================================================
--- engine.js	(revision 2687)
+++ engine.js	(working copy)
@@ -1466,19 +1466,20 @@
           batch.encType = "multipart/form-data";
         }
         var idname = dwr.engine.transport.iframe.getId(batch);
-        batch.div = document.createElement("div");
         if (dwr.engine.isIE) {
-             document.body.appendChild(batch.div);
-             batch.div.innerHTML = "<iframe src='javascript:void(0)' frameborder='0' style='width:0px;height:0px;border:0;' id='" + idname + "' name='" + idname + "' onload='dwr.engine.transport.iframe.loadingComplete(" + batch.map.batchId + ");'></iframe>";
-             batch.iframe = batch.div.firstChild;
-         } else {
-           batch.iframe = document.createElement("iframe");
-           batch.iframe.setAttribute("id", idname);
-           batch.iframe.setAttribute("name", idname);
-           batch.iframe.setAttribute("frameborder", "0");
-           batch.iframe.setAttribute("src", "about:blank");
-           batch.iframe.setAttribute("onload", "dwr.engine.transport.iframe.loadingComplete(" + batch.map.batchId + ");");
-           document.body.appendChild(batch.iframe);
+          batch.div = document.createElement("div");
+          document.body.appendChild(batch.div);
+          batch.div.innerHTML = "<iframe src='javascript:void(0)' frameborder='0' style='width:0px;height:0px;border:0;visibility:hidden;' id='" + idname + "' name='" + idname + "' onload='dwr.engine.transport.iframe.loadingComplete(" + batch.map.batchId + ");'></iframe>";
+          batch.iframe = batch.div.firstChild;
+        } else {
+          batch.iframe = document.createElement("iframe");
+          batch.iframe.setAttribute("id", idname);
+          batch.iframe.setAttribute("name", idname);
+          batch.iframe.setAttribute("frameborder", "0");
+          batch.iframe.setAttribute("src", "about:blank");
+          batch.iframe.setAttribute("style", "width:0px;height:0px;border:0;visibility:hidden;");
+          batch.iframe.setAttribute("onload", "dwr.engine.transport.iframe.loadingComplete(" + batch.map.batchId + ");");
+          document.body.appendChild(batch.iframe);
         }
         batch.document = document;
         dwr.engine.transport.iframe.beginLoader(batch, idname);
@@ -1510,12 +1511,16 @@
           // TODO: On firefox we can now get the values of file fields, maybe we should use this
           // See http://soakedandsoaped.com/articles/read/firefox-3-native-ajax-file-upload
           // setting enctype via the DOM does not work in IE, create the form using innerHTML instead
-          var formHtml = "<form id='dwr-form' action='" + request.url + "' target='" + idname + "' style='display:none;' method='" + batch.httpMethod + "'";
-          if (batch.encType) formHtml += " enctype='" + batch.encType + "'";
-          formHtml += "></form>";
-          var div = batch.document.createElement("div");
-          div.innerHTML = formHtml;
-          batch.form = div.firstChild;
+    	  batch.form = batch.document.createElement("form");
+          batch.form.setAttribute("id", "dwr-form-" + idname);
+          batch.form.setAttribute("action", request.url);
+          batch.form.setAttribute("target", idname);
+          batch.form.setAttribute("style", "display:none");
+          batch.form.setAttribute("method", batch.httpMethod);
+          if (batch.encType) {
+            batch.form.setAttribute("encType", batch.encType);
+            batch.form.setAttribute("encoding", batch.encType);
+          }
           for (var prop in batch.map) {
             var value = batch.map[prop];
             if (typeof value != "function") {
@@ -1537,7 +1542,7 @@
               }
             }
           }
-          batch.document.body.appendChild(batch.form);
+          document.body.appendChild(batch.form);
           batch.form.submit();
         }
       },
@@ -1549,7 +1554,8 @@
        */
       loadingComplete:function(batchId) {
         var batch = dwr.engine._batches[batchId];
-        if (batch) dwr.engine.batch.validate(batch);
+        if (batch && batch.iframe && (batch.iframe.src != "about:blank"))
+          dwr.engine.batch.validate(batch);
       },
 
       /**