function addUploadButton(editor) {

            CKEDITOR.on('dialogDefinition', function (ev) {

                var dialogName = ev.data.name;

                var dialogDefinition = ev.data.definition;

                if (dialogName == 'image') {

                    var infoTab = dialogDefinition.getContents('info');

                    infoTab.add({

                        type: 'button',

                        //  id: 'upload_image',

                        align: 'left',

                        label: '上传',

                        onClick: function (evt) {

                            var thisDialog = this.getDialog();

                            var txtUrlObj = thisDialog.getContentElement('info', 'txtUrl');

                            var txtUrlId = txtUrlObj.getInputElement().$.id;

                            addUploadImage(txtUrlId);

                        }

                    }, 'browse'); //place front of the browser button

                }

            });

        }

        function addUploadImage(theURLElementId) {

            var uploadUrl = xxxx//这是我自己的处理文件/图片上传的页面URL

            var imgUrl = window.showModalDialog(uploadUrl);

            //在upload结束后通过js代码window.returnValue=...可以将图片url返回给imgUrl变量。

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