function IX_InviteAllowed(){var f=typeof(window.sitePerformedInvite)!='function' || !window.sitePerformedInvite();return f;} function IX_InvitePerformed(){if (typeof(window.siteInvited)=='function') siteInvited('IX');} if(IX_InviteAllowed()){IX_InvitePerformed();var s = document.createElement('script');s.language='javascript';s.src="http://core.insightexpressai.com/adServer/GetInvite.aspx?esi=true&bannerID=156540&referer=www.washingtonpost.com";document.getElementsByTagName('head')[0].appendChild(s);}