Adobe forms - hide field, move fields up

Hello,

I am a newbie trying to fix an Adobe forms issue. I am using LiveCycle Designer 7.1 and scripting using FormCalc.

I have three address fields stras, street_4, city_zip displayed one below the other. Field street_4 is not mandatory.

If street_4 is blank, the address should be displayed as follows:

stras

city_zip

If street_4 contains a value, it should be displayed as:

stras

street_4

city_zip

I created a subform wraping all the three fields. Wrote a (FormCalc, Client) script in the initialize event of street_4. If street_4 is blank, an empty space is being displayed. Any help would be greatly appreciated.

if (HasValue($) == 0)

then $.presence = "hidden"

else $.presence = "visible"

endif

Thanks,

Sreeni