javascript window.open single window

[Mani Gudavalli <Manidhar.Gudavalli@eds.com>]

HI
I have this javascript. When I poast my page to itselft based on the 
data this sctipt is executed and loads a popup window. However, each 
time I submit the page it is opening a new window. How to control my 
javascript to allways focus on the same popup window.
In popup window , I display one page but redirected to a different site 
in the popup.

example: popup link: mylink is a.jsp but that is redirected to www.yahoo.com

thanks
MANI

function popupnr(mylink, windowname, refocus, wrongData)
{

var mywin, href;
if (typeof(mylink) == 'string')
href=mylink;
else
href=mylink.href;
if (!window.mywin ) {
mywin = window.open('', windowname, 'width=800,height=600,scrollbars=yes');
}
// if we just opened the window
if (
mywin.closed ||
(! mywin.document.URL) ||
(mywin.document.URL.indexOf("about") == 0)
)
mywin.location=href;
else if (refocus)
mywin.focus();
return false;

}
//-->
</SCRIPT>