Javascript - can I use that on my blog?

No. Javascript can be used for malicious purposes and while what you want to do is okay it does not mean all javascript will be okay. The security of all the blogs here is paramount and until such time that we can guarantee that scripting languages will not be harmful they will not be permitted.

If you need proof of what javascript can do, it took MySpace.com offline, (another source) and it also took the 2 million users of LiveJournal offline.

You may want a bit of javascript and it may well be harmless but as soon as the system allows it someone will try and exploit it. Their goal would be to take this domain offline - is your need greater than all the blogs on here?

All requests for javascript by way of the forums or feedback will be met with a ‘No’ for the above reasons.

Using a different syntax WordPress.com does support JavaScript from trusted partners such as You Tube and Google Video. If you know of another service that we should support please send feedback.