Il mio caso è così:

Codice PHP:
************************
*   
DIV1                               *
*                                        *
*        **********              *
*        * 
DIV2        *             * 
*        *               *             *
*        *               *             *
*        **********              *
*                                        *
*                                        *
*                                        *
************************
                
DIV3 
Andando nel DIV2 il DIV3 (nascosto) deve salire.
GRAZIE!!!