Hide Pages From Menu ?

On my site (http://zoddy.weblogs.us) which i recently started i have made some pages as they will be relatively static content.
It will be some tech supporty type stuff that i will use or pass on to friends when required. At present i’ve only added one quick page as a test.

My problem is that on my first page (index) in my menu it lists the following:

HEADING (Pages)
– Page 1 Topic
– Page 2 Topic
— Page 2 Child SubTopic
— Page 2 Child Child Subtopic

Maybe that doesn’t make sense, but if you look at my blog on the page link titled ‘remove rogue files’ you’ll see what i mean.

Is it possible to hide those child topics/pages unless their parent is opened?
So in my case all you would see would be:

Java
Server Administration

If Server Admin is clicked open that page would open up the submenu etc..?
Otherwise if i add say 15 pages the page section alone will fill up the screen…

Thank you in advace…
Nathan