function openWindow(theURL,winName,winWidth,winHeight,features) {
 var w = (screen.width - winWidth)/2;
 var h = (screen.height - winHeight)/2 - 50;
 features = features+',width='+winWidth+',height='+winHeight+',top='+h+',left='+w;
 window.open(theURL,winName,features);
}