[jQuery] why does $('.myDiv', top.frames[0]).hide() not work?

[jquertil]

I'm totally not getting it... but you might, I hope :)


I appended an iframe:

$('body').append('<iframe>...etc</iframe>');

The iframe source has jquery in the header and it works.

now I want to do something in that iframe, like hide a div. I want to
do this from the top.frame...

$('.myDiv', top.frames[0]).hide();

but, it doesn't work!??!?

I'm lost. Been googling, all I find is stuff about getting stuff to
work in the parent frame - why wouldnt the same work for a child
frame?

THanks for pointers! much obliged...