Everyone thanks for the great help. This was for me the solution. Thanks Guido It's not necessary to use buttons and navigation bar! If you want change manually most slides, set a very high duration for each slide in "Project Options" (boxig said 5000 sec, but you can select also 500 = 8.3 minutes!). To change slide you can use the mouse, but also Spacebar, or Left Arrow, or Page Down keys on the keyboard (maybe this solution can be more convenient). For pictures you want to see fast, customise your slides (10 - 11 - 12 - 13 in your example) for a minimum time such 1 (or two, or 10 - it is the same) ms, BUT DON'T SET 0 sec. 0 ms.!!! In PTE, this setting locks the slide for an indefinite time. -------------------- Guido Torino, Italy