Hide nodes in a subform inside item table

Hello experts,

Following is my scenario:

I have a form with an Item subform in the body page. within this subform, i have one more subform "AAA" which has 3 fields. these 3 fields are bound to a work area which is being passed in from the print program.

Now even if one of these 3 fields does not contain a value, i need to hide the subform "AAA".

i have tried scripting like :

if ($.rawvalue eq null) then

{

     $.presence = "hidden";

}

kindly help me out fellows !

thanks in advance

Suhas