[join]

<input type="text" value="http://insu.лт/" id="as" contenteditable />
<div id="sup">урл'ы</div>
<script>
function link(){ 
  var url = document.getElementById("as").value;
  if (url){ 
    document.execCommand("createlink", false, url);
    document.getElementById("sup").innerHTML += ( url + '<br/>');	
  }
}

document.getElementById("as").addEventListener( "input", function (){
  link();
});
</script>

в head добавить

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />