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Is this possible?
I would strongly advise you against resizing and repositioning the main browser window. I, and I think most other people, would find that irritating and a little presumptuous.
What you might consider doing if this type of presentation is essential is open a popup window upon loading the main page set to the size and position you need, and providing a "launch" link for users who may be using popup blockers. That way the users retain control over their browsers but you have control over your presentation. You may have seen all-Flash sites which use this method.
Additionally, some browsers allow the user to deactivate resizing/repositioning in the first place, and as you do not generally know what the user's screen size is (a 1.8" cell phone or 36" LCD) we're almost always better off designing "pixel-independent" so to speak.
But if you absolutely absolutely must,
<body onLoad="window.resizeTo(w,h);window.moveTo(x,y)">
where width, height, x position and y position are expressed in pixels.
The user overrides it if they want either by not running Javascript or by manua changing the size of the window once it's open.
[added]Written at the same time as choster's much better and more complete message - oh and a welcome to Webmaster World from me too][/added]
Unfortunately, the destination position of a Javascript moveTo is defined from the top left and no other way. But you can add JS to retrieve the screen size, and then calculate what the margin would be from the top left instead of the top right.
There are several related JS variables about whose vintage I do not venture a guess:
screen.width and screen.height-- simply the width and height of the screen in pixels
screen.availWidth and screen.availHeight-- width/height of the screen in pixels minus "fixtures" like the Windows or MS Office taskbars
Borrowing then from rtfm.atrax.co.uk/infinitemonkeys/articles/javascript/967.asp (I'm actually rather far from a JS expert-- we try not to use it)
<script type="text/javascript">
function start() {// retrieve user's available screen resolution
w = window.screen.availWidth;
h = window.screen.availHeight;
// resize window according to space available, up to 750x350 if possible
resizedW = (w >= 750)? 750 : w;
resizedH = (h >= 350)? 350 : h;
window.resizeTo(resizedW,resizedH);
// to align the window to the right, subtract its
// width from the available space to find the x value of
// the left margin; set y to zero for top
var x = (w - resizedW);
var y = 0;
window.moveTo(x,y);
}
</script>
<body onLoad="start();">
