opdater string i tabel

Noget i denne stil:


<HTML>
<HEAD>
<Script LANGUAGE=\"JavaScript\">
<!--
function skift(tekst)
{
  if (navigator.appName==\"Microsoft Internet Explorer\")
  {
  layerIE.innerHTML=\'<FONT FACE=\"Tahoma\" SIZE=\"2\">\'+ tekst +\'</FONT>\';
  }
  if (navigator.appName==\"Netscape\")
  {
  document.layers.layerNC.document.open();
  document.layers.layerNC.document.write(\'<FONT FACE=\"Tahoma\" SIZE=\"2\">\'+ tekst +\'</FONT>\');
  document.layers.layerNC.document.close();
  }
} 
//-->
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE=\"JavaScript\">
if (navigator.appName==\"Netscape\")
{
document.writeln(\'<Layer name=\"layerNC\" visibility=\"show\"><FONT FACE=\"Tahoma\" SIZE=\"2\"></FONT></Layer>\');
}
if (navigator.appName==\"Microsoft Internet Explorer\")
{
document.writeln(\'<Div id=\"layerIE\" CLASS=\"chat\"><FONT FACE=\"Tahoma\" SIZE=\"2\"></FONT></Div>\');
}                 
</SCRIPT>
<BR>
<BR>
<BR>
<A HREF=\"bla.html\" ONMOUSEOVER=\"skift(\'hej\');\">Bla</A>
</BODY>
</HTML>