// JavaScript Document
function janela(pagina, nomeJanela, w, h) {
    var height = window.screen.height - 100;
    var width = window.screen.width;

    var top = (height - h) / 2;
    var left = (width - w) / 2;

    window.open(pagina, nomeJanela, 'top=' + top + ',left=' + left + ',width=' + w + ',height=' + h + ',toolbar=0,location=0,status=0,menubar=0,scrollbars=1,scrolling=1,resizable=1');
}