I installed JSDT for Eclipse - now how do I begin developing?
<p>I installed the "Eclipse IDE for JavaScript" (which may be JSDT from IBM); I've also installed Aptana Studio 3 (which resembles Eclipse); I've installed Firebug for Firefox.  In all three cases, I'm at a complete loss as to how to go about actually writing some HTML that contains (or sucks in) some JavaScript, and then test and debug it!</p>

<p>(UPDATE) To give a better notion of where I am: I can create a New Project and a New Javascript file, and I can type <code>show("Hello World!);</code> into the document and I can press the green Run button, which gives me the inscrutable message about "the selection did not contain any resources that can run on a server."  Obviously they assume some preliminary knowledge, which is what I'm seeking.</p>

<p>This isn't meant to start a war about the best IDE, so let's assume that "Eclipse IDE for JavaScript" is a good choice (despite the fact that it apparently only supports ECMAScript 3!  well, one step at a time).  Can someone recommend a guide or tutorial that might, say, walk me through Hello World?</p>
