function Cmp(zknm) {
   url = "http://www.donemus.nl/componist.php?zknm=" + zknm;
   window.location.href = url;
}

function Wrk(nr) {
   url = "http://catalogus.donemus.nl/minisis/uitgaven.php?/144/muzisn_link/uitgaven_detail/NUMDON+" + nr + "?COMMANDSEARCH";
   window.location.href = url;
}