function openCentrado(pUrl, pName, pWidth, pHeight, pFeatures) {
    var oLeft = screen.width / 2 - pWidth / 2;
    var oTop = screen.height / 2 - pHeight / 2;
    var oFeatures = "left=" + oLeft + ",top=" + oTop + ",width=" + pWidth + ",height=" + pHeight + "," + pFeatures;
    window.open(pUrl, pName, oFeatures);
}