jQuery Forum

I just want to share my web application I wrote using the themeroller as base.
All the themeroller's themes are available by default to users, and the users can create and upload yours own themes (created inside the web themeroller interface).

Title: plugChat.in - Free chat and tool bar for your site/blog/forum!
Website: http://plugchat.in/

Tiago

(can be integrated inside jquery core function 'jQuery.support')

I'm working on a shadow feature detection.
The idea is simple: if the browser have CSS3 shadow support, we will use it. Otherwise we will create a shadow box manually.

It's working very well so far! But I can't detect this on Opera.
Any ideas how to fix this? Any suggestion to improve this code?

/**
 * CSS Feature Detection: Shadow
 * Tested on: Firefox 3.0.18 and 3.6, IE 6, 7, 8, Chrome 5, Opera 10.5, Safari 4.0.5
 * On Opera we can't detect correctly. (todo)
 *
 * Author: Tiago Fischer (tiagofischer@gmail.com)
 */
function featureDetectionShadow() {
    var flagDetection = false;
    function shadowDetection($handle, css) {
        try {
            var shadow = $handle.css(css);
            if (shadow != 'null' && shadow != '') {
                var regTest = String(shadow.match(/AAAAAA/i));
                if (regTest != '') {
                    flagDetection = true;
                }
            }
        } catch(err) { };
    }           
    var $testOne = $('<div></div>').css('-moz-box-shadow', '0px 0px 8px 5px #AAAAAA');
    var $testTwo = $('<div></div>').css('-webkit-box-shadow', '0px 0px 15px #AAAAAA');
    var $testTree = $('<div></div>').css('box-shadow', '0px 0px 8px 5px #AAAAAA');
    shadowDetection($testOne, '-moz-box-shadow');
    shadowDetection($testTwo, '-webkit-box-shadow');
    shadowDetection($testTree, 'box-shadow');           
    return flagDetection;   
}