Hopefully the following notes will help.
If you want the images in your gallery to be displayed in full (without cropping), set imageScaleMode to either SCALE_DOWN or SCALE (in JuiceboxBuilder-Pro's 'Customize -> Main Image' section).
- in the upper 1/3 a transparent Navbar wich generel Titel and Navigate to 3 other Sides (Home / Architecture / Nature / ... / imprint)
Please take a look at the Using a Resizable Gallery with a Header support section. The View Resizable Gallery with Top Menu Example has a header of fixed height and the gallery takes up the remainder of the user's browser window. You can view the source of the web page in a browser and copy/modify the code to suit your own needs (by swapping the sample header content for your own navigation menu).
It might not be exactly what you want but if you want to overlay a transparent navigation menu on top of a Juicebox gallery, then knowledge of HTML, CSS (and perhaps JavaScript) would be required. It would not be something that could be implemented within Juicebox itself.
You could, however, embed links into the Gallery Title or Back Button as noted in these FAQs:
How do I add HTML formatting to the Gallery Title or Back Button?
- main page (as home) should play the automatic
If you want a Juicebox gallery to start an automated slideshow as soon as it loads, set enableAutoPlay="TRUE" and autoPlayOnLoad="TRUE" ('Customize -> AutoPlay'). You may also want to set enableLooping="TRUE" ('Customize -> General').
Use the following settings:
buttonBarPosition="NONE"
galleryTitlePosition="NONE"
backButtonPosition="NONE"
showImageNav="FALSE"
captionPosition="NONE"
Use the following settings:
showThumbsOnLoad="FALSE"
showSmallThumbsOnLoad="FALSE"
showThumbsButton="FALSE"
showSmallThumbsButton="FALSE"
- just the full picture ;)
Make sure that your gallery's dimensions match the aspect ratio of your images (so that there is no wasted space around your images within the gallery).
- special --- it is possible to link to the imprint so it come as overlay transparent layer at the side, so you can read it over the images?
I'm not entirely sure what you mean by this. You can set captionPosition="OVERAY_IMAGE" so that the image titles and captions appear on the image overlay (on top the the main image). However, the text will appear towards the bottom of the image, not the side.