Hi Radim!
I offer the females a segment of 
Reynoutria japonica or 
Heracleum mantegazzianum. Just cut 2 holes in it, place it in one corner of the tank and the 
Gonatodes albogularis will lay the egg in there. But you have to be sure, that you don´t mist into the segment - they don´t like wet places to drop the eggs. If your terrarium is high, you can also use more than one segment and the female has the chance to choose a segment with the optimal incubation-temperatur.
Here´s a pic of a 
Reynoutria japonica segment with "entry-holes":
Dateianhang:
			 Eiablageröhre.JPG [ 127.24 KiB | 15820-mal betrachtet ]
			Eiablageröhre.JPG [ 127.24 KiB | 15820-mal betrachtet ]
		
		
	 ..and one pic in the tank:
Dateianhang:
			 Eiablageröhre in Terrarium.JPG [ 137.2 KiB | 15819-mal betrachtet ]
			Eiablageröhre in Terrarium.JPG [ 137.2 KiB | 15819-mal betrachtet ]
		
		
	 You can find these plants nearly everywhere in europe. They are neophyts from other parts of the world and it´s helpful for the nature if you will cut them 
 
  Greetings
Dennis
PS: The idea comes from Sacha, i hope he won´t be angry that i posted it earlier 
