// zentrale verwaltung des Headers
function writeHeader() {
document.write('<img src="http://www.biologie-student.de/head.gif" width="983" height="96">');
document.write('<script src="http://www.biologie-student.de/menu.js"></script>');
document.write('<script menumaker src="http://www.biologie-student.de/nav2.js"></script>');
}

// <script src="http://www.biologie-student.de//menu.js"> 
// </script>
//<script menumaker src="http://www.biologie-student.de/nav1.js"> 
// </script>