First of all, did you try installing Skype before installing the libs? I've seen a few reports that there's no need to manually install ia32-libs on Quantal (ie - 32bit applications install just fine), though I haven't confirmed that myself. If you haven't, try that first. If you have, then continue on (and, since you're new, it'd be good to read on, anyway).
You don't need to download packages from packages.ubuntu.com in order to install them. That site is really only there for documentation and reference purposes.
All you need to do is open up terminal and run:
sudo apt-get install ia32-libs
It'll prompt you for your password. Put it in, and let it do its thing. Once it's done, you should be able to install Skype without issue.