Javascript, a couple more questions
<p>This is a bit of a round up of the things I haven't found clear answers to today.</p>

<ol>
<li><p>There appear to be different versions of Javascript, but I've not seen any books or web sites say "This targets ECMAScript version 2". There seems to be an ECMAScript 5 which if the wiki page is to be believed isn't used in any browsers. So do I need to know about versions?</p></li>
<li><p>Server side Javascript. I've seen a few mentions of this, and I haven't been looking at it specifically, but in a sentence or two, where is server side Javascript used and why? </p></li>
<li><p>I assume different browsers support different subsets (guessing) of Javascript, but then again, I haven't read that, it just seemed logical given the state of all the other web technologies. Is that right or am I way off?</p></li>
</ol>
