function openWindow(theURL,winName,winWidth,winHeight,otherFeatures) {

   var x = 0;

   var y = 0;

   x = (screen.availWidth - 12 - winWidth) / 2;

   y = (screen.availHeight - 48 - winHeight) / 2;

   if (otherFeatures != "") {otherFeatures = "," + otherFeatures}

   var features = "screenX=" + x + ",screenY=" + y + ",width=" + winWidth + 

",height=" + winHeight+",top="+y+",left="+x+"'" + otherFeatures

   var NewWindow = window.open(theURL,winName,features);

   NewWindow.focus();

}