<style type="text/css">
.div_right_bottom {
  padding:3px;
  position:fixed;
  top:70%;
  right:0px;
  _position: absolute; /* position fixed for IE6 */
  _top:expression(documentElement.scrollTop+100);
  z-index:3;
}
</style>

<table class="div_right_bottom">
<tr>
<td><a><img border="0" src="../skype-01.gif"></a></td>
</tr>
<tr>
<td><a href="skype:test@com.tw?chat"><img border="0" src="../skype-02.gif"></td>
</tr>
<tr>
<td><a href="skype:testcom?chat"><img border="0" src="../skype-03.gif"></td>
</tr>
</table>