HTML/CSS “Pop-Up” Window and Disabled Background

This is a silly question since I can't find the right keywords to use to get the answer by searching Google, unfortunately.

You know when you click a link and the background dims and becomes unusable but the foreground either has an image or a sign-in box usually? Like the Yahoo mail image displaying method where everything in the background becomes grey transparent and the image itself is just fine?

How is that done? And what is it called?

Answers:

Answer

it's done by creating an overlaying div on the fly in JS, like:

var gab = document.createElement('div');
  gab.setAttribute('id', 'OVER');
  gab.innerHTML='<div class="overlay"><h1>hello</h1></div>';
  document.body.appendChild(gab);

use a CSS class like

#OVER{width:100%; height:100%; left:0;/*IE*/ top:0; text-align:center; z-index:5; position:fixed; background-color:#fff;}
.overlay {width:100%; z-index:6; left:0;/*IE*/ top:30%; font-color:#cdcdcd; font-size:0.8em; text-align:center; position:fixed; background-color:#000;}

dunno how it's called ..

Answer

You want to create a "modal box" or "lightbox". Examples:

Answer

For images and stuff i use prettyphoto

For text popup Dialog

this is all done with the use of jquery a javascript

Answer

You can use smoothbox, along with mootools.

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