function writeHeader() {    // 
document.write('<table cellspacing="10" cellpadding="0" width="100%" border="0">');
document.write('<tr> ');
document.write('<td height="17">&nbsp;</td> ');
document.write('<td align="right" valign="middle" rowspan="2"><a href="http://www.weizmann.ac.il" border="0"><img src="/particle/image/weizlogo.gif" border="0"></a></td></tr>');
document.write('<tr>');
document.write('<td align="left" valign="top"><img src="/particle/image/headerhome.gif"></td>');
document.write('</tr>');
document.write('</table>');
}