怎么才能弹出多个窗口呢,我弹出的窗口总是覆盖掉原来的那个!


<input class=submita type="button" name="Button" value="弹出" onclick="openwindows()">
  <script>
function openwindows()
{
open("pop.html", "_blank", "width=370,height=348,center=yes,scroll=0,fullscreen=0,toolbar=0,scrollbars=0,location=0,directories=0,status=0,menubar=0,resizable=0,help=0,resizable=1");
}
</script>
</p>
<p>
<a link="javascript:openwindows()">aaaaaaaaaaaa</a>