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This option defines the URL to post files through the "Upload Tab" in the image dialog. It can point to the default file uploader:
FCKConfig.ImageUploadURL = FCKConfig.BasePath + 'filemanager/connectors/' + _QuickUploadLanguage + '/upload.' + _QuickUploadExtension ;
or any custom implementation of it:
FCKConfig.ImageUploadURL = '/myuploader/upload.php';