function bildwechsel() {
var num=Math.floor(Math.random()*4)+1;
document.writeln("<img src='startbild"+num+".jpg' width='200' height='250' class='bild_links'>");
}

function bildschmuck() {
var num=Math.floor(Math.random()*5)+1;
document.writeln("<img src='schmuckbild"+num+".gif' width='150' height='90'>");
}

function fenster_offen(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}