[jQuery] How to access javascript variable of another frame?

[jQuery] How to access javascript variable of another frame?


Hi,
If I have a page that has the following JS in header:
<script>
x="someValue"
</script>
and it has a child frame, how can I acces the value of the top page?
top.$("?????").
I already tried top.$("#x") but it couldn't be read.
Is it even possible to access variables through frames?