[SOLVED] Display "Please wait" on saving record

Hi
I'm trying to display a "Please wait.." Information (like the please wait on list pages) after the user clicked on the save button. Generally saving is under a second, and the user is satisfied and there will be no need to display anything!

But like always, I now have the problem that the record includes 10 pictures. This images are added on the fly by a smartphone (Iphone or Android) and if the user hits on the "save" button, if will take, depending the cell connexion speed, between 10 and 30 seconds and even more!.

The user thinks "S... it doesn't work.......

Is there a way to display a notification "Please wait..." until the "upload" is done?

Thanks for any help
Yves