function popup(url)
{
    var newwin = window.open(url,'newwindow','width=550,height=406,resizable=no,titlebar=no,scrollbars=no');
    
    return;
}
function ventana(url, width, height)
{
    var newwin = window.open(url, 'ventana', 'width='+width+',height='+height+',resizable=no,titlebar=no,scrollbars=no'); 
    return;
}