function ext(){
lokal = new RegExp("http://.*antonindanek.cz.*","i")
var link = document.getElementById("hlavni").getElementsByTagName("a");

for(var i=0;i<link.length;i++){

if(link[i].getAttribute("href").search(lokal) == "-1")
link[i].innerHTML += "<img src='http://blog.antonindanek.cz/grafika/externi-odkaz.gif' alt='externi odkaz' style='margin-left: 0.5ex; margin-bottom: 0.5ex;'>";

}

}