How to Create a Modal to Cover Entire Web Page using CSS and JavaScript

I am new to web developing, and I was wondering how one would create a modal over an entire web page. The goal is to grey out the entire contents of the web page, coded in asp .net, and make a custom message box popup using JavaScript code. (I have attached the code for the basic *.aspx page for reference.) Could someone let me know what would be the basic method and the basic code, maybe illustrated with an example, to grey out an entire page and make a modal window appear on the page, without being a JavaScipt popup window, on the same page? Any help would be greatly appreciated.
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thenthorn1010Asked:
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Tony van SchaikFront-end Web developerCommented:
With only CSS this is quite tricky, because those Javascript lightbox/thickboxes also have some cross-browser fixes in it.

For example the way Firefox renders the opacity is different than in Internet Explorer and don't forget about all those older browser versions like IE6, IE8, quirksmode etc

If you want to use CSS for fixing everything is a lot of work, the javascripts versions do these checks and fixes for you based on the browser that visits your website.

The modal dialogs i use are these:

http://jqueryui.com/demos/dialog/
http://www.no-margin-for-errors.com/projects/prettyphoto-jquery-lightbox-clone/
http://www.shadowbox-js.com/

My advice, use a javascript version it's more bulletproof. And it some much easier to maintain and use it for other purposes on your website, like loading an image in the dialog box or video, iframe and so on.
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