function header() {
   document.write('<div class="header">');
   document.write('<div class="inner_header">');
   document.write('<table class="head_table">');
   document.write('<tbody>');
   document.write('<tr>');
   document.write('    <td class="logo_td" > <img src="Bilder/Firmenlogo_gold.jpg" alt="Firmenlogo Pianohaus Hartmann" border="0" height="65" width="400"/> </td>');
   document.write('    <td class="tasten_td"> <img src="Bilder/test_klaviatur2.jpg" alt="Klaviatur"  border="0" height="65" width="300"/></td>');
   document.write('</tr>');
   document.write('</tbody>');
   document.write('</table>');
   document.write('</div>');
   document.write('</div>');
}