怎样控制表中的某一行的显示?

Question

<INPUT type="button" onClick="tr1.style.display=''" value="show">
<INPUT type="button" onClick="tr1.style.display='none'" value="hide"><P>
<TABLE width="70%" border="1" cellspacing="0" cellpadding="0">
  <TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
  </TR>
  <TR id="tr1">
    <TD>aaaa</TD>
    <TD>aaaa</TD>
    <TD>aaaa</TD>
  </TR>
  <TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
  </TR>
</TABLE>
<P>

Answer 1

<td id=row1 style="DISPLAY: none"></td>
在javascript中，
function show()
{
   row1.style.display="";//即可显示 
}