<HEAD>
<SCRIPT>
function insertRow() {
  tb = document.getElementById("tb");
  fr = tb.childNodes[0];
  nr = document.createElement("TR");
  nc = document.createElement("TD");
  nc.appendChild(document.createTextNode("second row"));
  nr.appendChild(nc);
  tb.insertBefore(nr,fr);
}
</SCRIPT>
</HEAD>
<BODY>
<TABLE>
<THEAD>
<TR>
  <TD>The head</TD>
</TR>
</THEAD>
<TBODY ID="tb">
<TR>
  <TD>First row</TD>
</TR>
</TBODY>
</TABLE>
<FORM>
<INPUT type=button value="insert" onclick="insertRow();">
</FORM>
</BODY>