Hi, i would like to ask how can i display folder gallery view.  :(

I have 10 galleries with 10 photos for each gallery and i want to display a photo for each folder.
So when the user clicks the folder A photos
a) in a pop-up it shows all photos from folder A
b) refresh the page and show thumbnails for folder A

Thanks  ;D

Could you be more specific about b)?

Sorry Katia, i will rephrase it:

i would like to ask how can i display folder gallery view. 

I have 10 galleries with 10 photos for each gallery and i want to display a photo for each folder (as a folder photo)
Actions:
1) So when the user clicks the folder A photo or folder B photo
2) in a pop-up or in a new page it shows all photos from folder A or folder B photo...

Check the gallery 3 with the single thumbnail here: www.joomlaworks.net/content/view/51/41/
Is that what you are looking for ( I mean having 10 galleries like this one and have only 10 thummbnails -one for each gallery-).
If this is the case -yes you can do it.

Yes!

How can i do it, in the same page?  ;)

Check the Custom galleries paragraph in SIG PRO documentation please.