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--- fineuploader-3.0.js	2012-11-16 21:30:02.000000000 +0100
+++ fineuploader-3.0.patched.js	2012-12-04 10:21:56.799781578 +0100
@@ -1796,7 +1796,15 @@
         var protocol = this._options.demoMode ? "GET" : "POST"
         var form = qq.toElement('<form method="' + protocol + '" enctype="multipart/form-data"></form>');
 
-        var queryString = qq.obj2url(params, this._options.endpoint);
+        // Params arn't given through form's action anymore but appened into it.
+        var queryString = qq.obj2url({}, this._options.endpoint);
+        for (paramName in params) {
+          var paramInput = document.createElement("input");
+          paramInput.setAttribute('type', 'text')
+          paramInput.setAttribute('name', paramName)
+          paramInput.setAttribute('value', params[paramName])
+          form.appendChild(paramInput);
+        }
 
         form.setAttribute('action', queryString);
         form.setAttribute('target', iframe.name);
@@ -1904,7 +1912,13 @@
         // build query string
         params = params || {};
         params[this._options.inputName] = name;
-        var queryString = qq.obj2url(params, this._options.endpoint);
+
+        var queryString;
+        if (this._options.forceMultipart) {
+          queryString = qq.obj2url({}, this._options.endpoint);
+        } else {
+          queryString = qq.obj2url(params, this._options.endpoint);
+        }
 
         var protocol = this._options.demoMode ? "GET" : "POST";
         xhr.open(protocol, queryString, true);
@@ -1913,6 +1927,7 @@
         xhr.setRequestHeader("Cache-Control", "no-cache");
         if (this._options.forceMultipart) {
             var formData = new FormData();
+            for (paramName in params) formData.append(paramName, params[paramName]);
             formData.append(this._options.inputName, file);
             file = formData;
         } else {