function showIndex(menuNr) {

document.write("<div class='cssmenu'><a href='opgave-maskinen.html'");
if (menuNr == 1) document.write(" id='current'");
document.write(">Beskrivelse<br></a>");

document.write("<a href='opgave-krav.html'");
if (menuNr == 2) document.write(" id='current'");
document.write(">Systemkrav<br></a>");

document.write("<a href='opgave-priser.html'");
if (menuNr == 3) document.write(" id='current'");
document.write(">Priser<br></a></div>");
}