jquery window.parent

Question

I can use this just fine in a window

$('#dropDownSpan').css('visibility', 'visible'); 

but how can I use it in another window which is child of this window or may be opened by this window.

I tried:

 $window.parent.('#dropDownSpan').css('visibility', 'visible'); 

but that didnt work, any idea?

Answer 1

$('#dropDownSpan', window.parent.document).css('visibility', 'visible');