FLEX 执行javascript语言

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundImage="image/3.jpg">
<mx:Script>
<![CDATA[
  internal function openUrl():void{
    ExternalInterface.call("function(){window.location.href='http://www.baidu.com';}");
   }  
]]>
</mx:Script>
<mx:TextInput x="310.5" y="167"/>
<mx:TextInput x="310.5" y="207"/>
<mx:Button x="281.5" y="252" label="登录" click="openUrl()"/>
<mx:Button x="383.5" y="252" label="重新添加"/>
<mx:Label x="267.5" y="167" text="用户名：" color="#F9F9FB"/>
<mx:Label x="267.5" y="207" text="密码：" color="#FBFCFC"/>
</mx:Application>