Inline Modal Window with CSS and jQuery

Sample

Sample, click here to see popup

---

<a href="#?w=500" rel="popup_name" class="poplight">Learn More</a>

<div id="popup_name" class="popup_block">
    <h2>This div will popup</h2>
    <p>I am the DIV that will popup.</p>
	<p>To create one like me</p>
	<p>href - #?w=500 specifies the width of the popup</p>
	<p>rel – Set a unique rel for this Popup</p>
	<p>class="poplight" – Class needed to trigger popup</p>
</div>

<a href="#?w=500" rel="popup_name" class="poplight">Learn More</a>
<div id="popup_name" class="popup_block">
    <h2>This div will popup</h2>
    <p>I am the DIV that will popup.</p>
	<p>To create one like me</p>
	<p>href - #?w=500 specifies the width of the popup</p>
	<p>rel – Set a unique rel for this Popup</p>
	<p>class="poplight" – Class needed to trigger popup</p>
</div>
<style>
#fade { /*--Transparent background layer--*/
	display: none; /*--hidden by default--*/
	background: #000;
	position: fixed; left: 0; top: 0;
	width: 100%; height: 100%;
	opacity: .80;
	z-index: 9999;
}
.popup_block{
	display: none; /*--hidden by default--*/
	background: #fff;
	padding: 20px;
	border: 20px solid #ddd;
	float: left;
	font-size: 1.2em;
	position: fixed;
	top: 50%; left: 50%;
	z-index: 99999;
	/*--CSS3 Box Shadows--*/
	-webkit-box-shadow: 0px 0px 20px #000;
	-moz-box-shadow: 0px 0px 20px #000;
	box-shadow: 0px 0px 20px #000;
	/*--CSS3 Rounded Corners--*/
	-webkit-border-radius: 10px;
	-moz-border-radius: 10px;
	border-radius: 10px;
}
img.btn_close {
	float: right;
	margin: -55px -55px 0 0;
}
/*--Making IE6 Understand Fixed Positioning--*/
*html #fade {
	position: absolute;
}
*html .popup_block {
	position: absolute;
}
</style>
<script>
$(document).ready(function() {
	//Code goes here
//When you click on a link with class of poplight and the href starts with a # 
$('a.poplight[href^=#]').click(function() {
    var popID = $(this).attr('rel'); //Get Popup Name
    var popURL = $(this).attr('href'); //Get Popup href to define size

    //Pull Query & Variables from href URL
    var query= popURL.split('?');
    var dim= query[1].split('&');
    var popWidth = dim[0].split('=')[1]; //Gets the first query string value

    //Fade in the Popup and add close button
    $('#' + popID).fadeIn().css({ 'width': Number( popWidth ) }).prepend('<a href="#" class="close"><img src="close_pop.png" class="btn_close" title="Close Window" alt="Close" /></a>');

    //Define margin for center alignment (vertical   horizontal) - we add 80px to the height/width to accomodate for the padding  and border width defined in the css
    var popMargTop = ($('#' + popID).height() + 80) / 2;
    var popMargLeft = ($('#' + popID).width() + 80) / 2;

    //Apply Margin to Popup
    $('#' + popID).css({
        'margin-top' : -popMargTop,
        'margin-left' : -popMargLeft
    });

    //Fade in Background
    $('body').append('<div id="fade"></div>'); //Add the fade layer to bottom of the body tag.
    $('#fade').css({'filter' : 'alpha(opacity=80)'}).fadeIn(); //Fade in the fade layer - .css({'filter' : 'alpha(opacity=80)'}) is used to fix the IE Bug on fading transparencies 

    return false;
});

//Close Popups and Fade Layer
$('a.close, #fade').live('click', function() { //When clicking on the close or fade layer...
    $('#fade , .popup_block').fadeOut(function() {
        $('#fade, a.close').remove();  //fade them both out
    });
    return false;
});
});
</script>

Reference

http://www.sohtanaka.com/web-design/inline-modal-window-w-css-and-jquery/
http://www.sohtanaka.com/web-design/examples/modal-window/