<input type=button onclick="vbs:openWin" value=open>
<script language="vbscript">
dim win
dim a
Set win = Nothing
sub openWin()
If win Is Nothing Then
set win=window.open("about:blank")
win.document.body.innerHTML="First New"
else
If win.closed Then
set win=window.open("about:blank")
win.document.body.innerHTML="New"
Else
win.focus
win.document.body.innerHTML="Exists"
End If
end if
<button onclick="vbs:openWin">open</button>
<input type="hidden" id="hhh" value="0">
<script language="vbscript">
dim win
dim a
sub openWin()
hhh.value=int(hhh.value)+1
if isobject(win) then
win.document.body.innerHTML=win.opener.document.getElementById("hhh").value +1
else
set win=window.open("about:blank")
win.document.body.innerHTML =win.opener.document.getElementById("hhh").value +1
end if
end sub