z="unten"; //Zielframe für die Links des Menüs
function changeURL(w) {

window.location.href=document.menuform.elements[w].options[document.menuform.elements[w].selectedIndex].value;
document.menuform.elements[w].selectedIndex=0;
}

function makeMenu() {
document.write("<form name='menuform'><table bgcolor='#D0D0D0' border='0' cellspacing='0' cellpadding='0'>");
for (i=0; i < a.length; i++){
    document.write("<tr><td><select size='0' onChange='changeURL("+i+")'>");
    for (j=0; j < a[i].length; j++){
        document.write("<option value='"+a[i][j]+"'>"+a[i][++j]);
        }
    document.write("</select></td></tr>");
    }
document.write("</table></form>");
}