function openWin(url, name, param){
  if(!url)return;
  if(!name) name = "win" + parseInt(Math.random() * 1000);
  if(!param) param = "";
  var win = window.open(url, name, param);
  win.focus();
}

function f_write_email() {
  var firstname = 'mail';
  var lastname = 'ralfsiebert';
  var extension = 'de';
  document.write('<a href="mailto:'+firstname+'\@'+lastname+'.'+extension+'">'+firstname+'\@'+lastname+'.'+extension+'</a>');
}