Center div horizontally

Question

On this page, I would like to horizontally center the main #container div relative to the page. Normally I would achieve this by adding a CSS rule,

#container { margin: 0 auto }

However, the layout of this page (which I did not write), uses absolute positioning for #container and most of its child elements, so this property has no effect.

Is there any way I can achieve this horizontal centering without rewriting the layout to use static positioning? I've no problem with using JavaScript/JQuery if that's the only way to achieving my objective.

Answer 1

Same as @rquinn answer but this will adjust to any width. Check this demo

http://jsfiddle.net/Starx/V7xrF/1/

HTML:

<div id="container"></div>

CSS:

* { margin:0;padding:0; }
#container {
    width:50px;
    position:absolute;
    height:400px;
    display:block;
    background: #ccc;
}

Javascript

function setMargins() {
    width = $(window).width();
    containerWidth = $("#container").width();  
    leftMargin = (width-containerWidth)/2;    
    $("#container").css("marginLeft", leftMargin);    
}

$(document).ready(function() {
    setMargins();
    $(window).resize(function() {
        setMargins();    
    });
});