function openChild(file, window) {
    childWindow = open(file, window, 'resizable=yes,width=860,height=640,toolbar=1,scrollbars=1,menubar=1,directories=1');
    if (childWindow.opener == null) childWindow.opener = self;
}

function update_parent() {
    window.opener.location.reload(false);
}

//$(function(){
//    var visibleState = $('#txt_login').css("visibility", ("visible" ? "true" : "false"));
//});