function WrEmail (a_email, b_email, linktext, betreff){
  if (b_email=="") { b_email = "darc.de"; }
  if (betreff=="") {
    document.write("<a href='mailto:"+a_email+"@"+b_email+"'>"+linktext+"</a>\n");
  }
  else {
    document.write("<a href='mailto:"+a_email+"@"+b_email+"?subject="+betreff+"' >"+linktext+"</a>\n");
  }
  
  
}