Catalogue-like display of a chart presentation resp. slide series

The special object can split the upload-File in preview images (gif/jpg/png) and the actual binary chartfile containing the charts e.g. in form of a PPT-file. The preview images must be put out in advance with the chart programme in an adequate small size as Batch. The images generate in each case one instance of the repetition element "preview" of which at a time two are listed side by side in the kind of a slide box. The upload file is deleted with each renewal of chartfile and preview.