function OpenCenteredWindow(theURL,winName,features, myWidth, myHeight, isCenter) { //v3.0
  if(window.screen)if(isCenter)if(isCenter=="true"){
    var myLeft = (screen.width-myWidth)/2;
    var myTop = (screen.height-myHeight)/2;
    features+=(features!='')?',':'';
    features+=',left='+myLeft+',top='+myTop;
  }
  window.open(theURL,winName,features+((features!='')?',':'')+'width='+myWidth+',height='+myHeight);
}

function popupwin(theURL) {
    OpenCenteredWindow(theURL,'popwin','location=0,toolbar=0,menubar=0,directories=0,status=0,resizable=0,scrollbars=yes', 610, 450, true);
}


function ChangeParentDocument(url) {
  opener.location = url;
  self.close();
}