Simple - I have a layout that is 800 by 600. When I press Ctrl and +, it zooms in and looks wonderful.
I want to know if there\'s a CSS/Javascript way to do the same
There is a zoom CSS property, but it is part of CSS3 and is most likely not widely supported. By setting this on the body element using JavaScript you can zoom the entire page.
I would agree with the sentiments of the answers to the question you linked to though in that it should be up to the user to choose their own zoom settings. If your site is too big/small to see, it indicates a problem with your site design.