[Mod] Hiện Tooltip khi rê chuột lên đối tượng

<script type='text/javascript' src='http://www.www.kiddy9.co.cc/html-h17.htm'></script>

#dhtmlpointer, #dhtmltooltip
{
  z-index: 999;
  left: -300px; top:0px;
  visibility: hidden;
  position: absolute;
}
#dhtmltooltip
{
  border: #666 2.4px solid;
  -moz-opacity: 0.8; /* lam mo tooltip FF */
  opacity: 0.8; /* lam mo tooltip Opera */
  filter: alpha(opacity=80); /* lam mo tooltip IE */
  -moz-border-radius: 6px;
  -webkit-border-radius: 6px;
  padding: 10px;
  font-size: 10pt;
  font-family: Arial;
  background-color: white;
  width: auto;
  max-width: 340px; /* chieu rong toi da cho FF */
  width:expression( document.body.clientWidth > 340? "340px": "auto" ); /* chieu rong toi da cho IE */
  text-align:left;
}

<span onmouseover="showtip('Nội dung trong tooltip');" onmouseout="hidetip();">Vùng rê chuột vào hiện tooltip</span>

<a href="{classical_row.recent_topic_row.U_TITLE}">{classical_row.recent_topic_row.L_TITLE}
</a>

<a onmouseover="showtip('Tiêu đề: {classical_row.recent_topic_row.L_TITLE}<br>Thời gian: {classical_row.recent_topic_row.S_POSTTIME}');" onmouseout="hidetip();" href="{classical_row.recent_topic_row.U_TITLE}">{classical_row.recent_topic_row.L_TITLE}</a>