Open Browser Window in ActionScript

open_window.as

function openWindow($url:String, $window:String = "_blank"):void {
    var req:URLRequest = new URLRequest($url);
    
    if (!ExternalInterface.available) {
        navigateToURL(req, $window);
    } else {
        try {
            var strUserAgent:String = String(ExternalInterface.call("function() {return navigator.userAgent;}")).toLowerCase();
            if (strUserAgent.indexOf("firefox") != -1 || (strUserAgent.indexOf("msie") != -1 && uint(strUserAgent.substr(strUserAgent.indexOf("msie") + 5, 3)) >= 7)) {
               ExternalInterface.call("function(url, target){window.open(url, target);return;}", req.url, $window);
            } else {
               navigateToURL(req, $window);
            }
        }catch (error:Error) {
            navigateToURL(req, $window);
        }
    }
}