function _uploadFile(oFiles, sNamespace){
        if(oFiles && oFiles.length){
            for(var i = 0; i < oFiles.length; i++){
                _uploadSingleFile(oFiles[i], _getSubmitId(), sNamespace);
            }
        } else {
            _uploadSingleFile(oFiles, _getSubmitId(), sNamespace);
        }
    }
Upload files

@param {Variant} oFiles FileList or File Object, HTMLInputElement(IE)
@param {String} sNamespace (Optional)