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How to make a whole webpage fit whatever window it is on like a scaled image and be unzoomable?

We used to have a silverlight page that used canvas to scale the page, this resulted in a page that would always be the size of the window it was on, making the whole page smaller if the window was smaller (it does preserve aspect ratio), as if the page was a single png but it isn't, it has dynamic elements. Also when one tries to zoom in or out, it does nothing, it just makes a scroll appear to the right and bottom without affecting the page.
We are migrating the page to HTML 5 with CSS, and we haven't been able to replicate this behavior. It is a page that has 10 small tables and each has 10 "messages" that can appear. When zooming in stuff starts to overlap in addition to change size, when resizing the window,stuff overlaps too but without changing size. Most of the positions are absolute but have % in their position onscreen. However we don't want it to be responsive, we want the behavior of the silverlight version. At least that's what the bosses want.
We have been researching how to do this but so far haven't really found a good solution, especially with messing the zoom functionality of browsers. most pages/forums say this shouldn't be done.
Edit:
For now I have added a bunch of max-width and max-height in the html style and body style, as well as added a media query for switching % left to px left for an absolutely positioned group of objects. However this is by no means whay I seek to accomplish. We need the whole page to behave like an bgimage, scaling every element with the size of the window.

show overlay objects only around the mouse not matter where in the screen

I'm working with svg files and some processing.js code to create a homepage.
It has some animation and static elements but the idea is to have everything the same but with different colours - Like an alternative homepage. I want this alternative to "peek" through as the mouse moves around. Only a small area around the mouse.
Does anyone have any idea how to do that?
since it isn't an image file it's a bit tricky.
I tried doing it by using the an image and the "drawing" element of processing.js thinking it could paint the alternative homepage, however it repeats the image everywhere the mouse go and what i want is for everything to remain in the same position only show the different colours in that spot.

You might consider superimposing two versions of your site, the "top" one completely covering the "bottom" one (make sure all backgrounds are opaque). Then you could try applying an SVG mask to the top page, making it transparent at a specific area and causing the bottom page to shine through. You could modify the mask as the mouse moves.
The other way round - i.e. clipping the top layer - is also thinkable.
I see the risk that this approach is slow and not consistent across browsers - you'd have to give it a try. Speed may differ depending on whether you clip/mask the top or the bottom layer.
W3C SVG Clipping, Masking and Compositing specs
MDN page on clipping and masking
MDN page on applying SVG effects to HTML content
If one version of the page can be converted to other by swapping out colors, SVG filters might be an option as well.

Zooming on click of large image to the coordinates of the click

So I have a large jpg, 12000px wide by 1000px height. I am looking to make a site the has the image at 50% size on page load, but when the user clicks on the image once, it zooms in to 100%, then on a second click, it zooms back out to original size.
Since the size of the image is so large, it would need to be draggable at both page load and during zoom state.
I have been playing around with this, but the code is not exactly what I am looking to do.
http://designshack.net/tutorialexamples/jQueryZoom/ZoomTest.html
Instead, I am looking to basically do the same thing as the zoomed in state of this site, minus the step of the click into the zoom state.
http://yogasmoga.com/women/run-jump-n-play-crop-462
If anyone has a plugin they have used, please let me know.

Don't. Easiest -especially if it's for a presentation- is to just use two images. image1.onclick -> show image2; image2.onclick -> show image1. Saves coding, does what you want.

How to simulate magnifying glass on Web-page image (Javascript)?

Google has the coolest effects - once it was a Pac-man game, today is apparently the 160th anniversary of the first World Fair, and Google's logo has an image of it. They also turn the mouse into a magnifying glass that can sweep over the picture (the gold ring).
I'm wondering how they do that. It's obviously Javascript, and I looked at the page source, but it's not especially readable (no surprise).

Looking at their source code, it seems they are using rather basic techniques to achieve this.
Ignoring all the embedded nifty animated gif's, there are basically two images - large, and small of the entire scene. The larger image is repeated thrice in the document. Look at the annotated image below to get a better idea of how the zoom works.
The portion inside the magnifying circle is split up in three div's - top, mid, and bottom. The overflow for each div should be hidden. Each div is relatively positioned inside the zoom circle. On mouse move, change the absolute position of the zoom circle to the mouse coordinates. Their example also uses CSS3 for the scaling and adding some animation delays.
Here's a sorta minimal reconstructed example.
Another example where we don't hide the div overflow to reveal the entire thing as a square.

Well, firstly, for anyone who wants to use such an effect, there are loads of jQuery plugins. Here are just a few:
Power Zoomer
Featured Image
Zoomer
Cloud Zoom
Secondly, it's quite easy to achieve. Just load the full-size image, but give it a width smaller than it's actual width, so it is scaled by CSS. Then, use JavaScript+CSS to create a Div (the magnifying glass) with the same image as background, but change the background-position property to the corresponding scaled x,y coordinate that the user's mouse is currently on.
There are other ways of doing it I suppose, and Google might be doing it differently, but this is the most obvious way for me that comes to mind.

Visit http://codeblab.com/glass/ for an real life example and in depth explanation of this technique. Flash and CSS v3 have ample functionality to construct a round magnifying glass.
However, simulate-a-circle-with-overlapping-rectangles works on (many) more platforms.
(DISCLOSURE: codeblab.com is my personal hobby blog with some weak links to my work in The Netherlands.)

There is a full example of magnifying any sort of HTML, including HTML5 at http://www.aplweb.co.uk/blog/js/magnifying-glass/. Works cross-browser too - although rounded corners are a bit iffy on most browsers - so you are going to have to use a box rather than circle.
Here is how to works:
Duplicate the content you want to zoom
Place the duplicated content into another element and set the visible width/height and overflow hidden
Use JavaScript to move the duplicated content so that it moves by the zoom amount * mouse movement. Also move the visible div by the mouse movement.
That is pretty much it too it. There are lots of little things to look out for though to make it work on all browsers.

I don't know how Google does it, since the logo is no longer showing in my area; but this effect can be achieved by clipping the enlarged animated GIF over the regular image using canvas. Alternatively, it is also possible to create create a circular clipping using CSS border-radius (commonly used to implement rounded corners).
EDIT: I've hacked this up together to show the basic technique that you need if you used CSS border-radius: http://jsfiddle.net/yjBuS/

Looks like they're using two images, one for the logo and one for the zoom (the zoomed one is actually sliced, to run the animations separately...?) They probably detect if the mouse is over the normal logo, then show the yellow circle and attach it to the mouse position. Then showing the other image, shifting it opposite of the mouse. Or something similar.

Image Zoom using javascript?

Has anyone got to some good code to zoom into an image using javascript?
I know I could just resize it etc but was being lazy and looking for something clever to zoom to different levels, move around when zoomed etc

Check this:
jQZoom
Zoomimage - jQuery plugin
jQuery ImgZoom
FancyBox

How big are the images?
If they are huge images you do them like google map style using this http://www.casa.ucl.ac.uk/software/googlemapimagecutter.asp

This really depends on what quality you are after. If you need a hires hiquality image with detailed zoom levels and proper interpolation you will need to write a backend service to serve up zoomed portions of your images. If you have no care for quality or speed, you could download the entire image and fit it to display inside a div absolutely positioned, offset for the area you want to view and sized as determined by your zoom level.
I would say you are probably after the first option. There are some tools already made for this, I persoanlly havnt used any of the tools; I am sure othes will post links to others you can try; I have written my own service and client. I cant go into the exact details as its proprietary, but I can give you an overview of what I do.
I have an asp.net generic handler that takes a query string denoting which image (by an id) and the coordinates to zoom on and the target image size. I have the service load the image and crop and resize it (its more complicated than that as I have many optimizations and preparsing when the file is originally uploaded, such as multiple cross sections of the file for faster serving when zooming, but what I describing here is the basics).
That service simply returns type image/jpeg and sends the image.
On the client side I have written a marquee box control that allows the user to marquee an area on the image they want to zoom in on. they marquee the area and click zoom. This then calculates the offsets into the image of the selected coordinates based on the original image size and the viewable image size. I send hese coords to the handler previously mentioned.I load the the url with query string of the srvice into an Image object, and handle onload. If all went well i then swap that to the viewed image and updates all my client side variables for determining where on the image I am zoomed into and then it can be zoomed again or zoomed out or panned further from there.
Now i understand your lazy requirement, but i need to say that writing this is actually quite easy to do to get the basics going. the hardest part you will find is doing a select box. But then even that can be as simple as tracking two click. Top left of the zoom select marque and bottom right. Or not having a select box at all and have a zoom in and out only at predetermined intervals. I on my projects required a zoom box as its a fairly complex image analysis solution.
I hope this at least helpful and leads you to something useful.