function popupnr(mylink, windowname, refocus)
{
var mywin, href;

if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;
   
mywin = window.open('', windowname, 'width=800,height=450,left=50,top=50,scrollbars=yes');
// use 620, 870 for instructions

// 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;
}