function writeHeader() {    // 
document.write('<table width="100%" cellpadding="0" cellspacing="0" border="0">');
document.write('<tr>');
document.write('<td align="left" valign="top"><img src="/complex/uzy/archaeomath/images/heading.gif"></td>');
document.write('</tr>');
document.write('</table>');
}