<form method="post" action="">
      <br />
      <textarea name="list_urls" id="list_urls" cols="60" rows="20"></textarea>
      <br />
      <br />
      <input value="Open URLs" class="submit" type="button" onClick="open_all();">
      <br />
      <input type="reset" value="Reset!">
      <br/>
    </form>

<script>
  function sleep(milliseconds) {
  var start = new Date().getTime();
  for (var i = 0; i < 1e7; i++) {
    if ((new Date().getTime() - start) > milliseconds){
      break;
    }
  }
  }
  function open_all() {
        var urls = document.getElementById("list_urls").value;
        var urls = urls.split(/s+/);
        var totalno = urls.length;
        var s;
        for (var i = 0; i < totalno; i++) {
            s = urls[i];
            if (s) {
                if (s.substr(0, 7) != 'http://' && s.substr(0, 8) != 'https://')
                    s = 'http://' + s;
                    sleep(5000);
                    window.open(s)
            }
        }
        return false;
    }
  </script>