function mail_open() {
window.open('http://www.hello-ldk.com/mail/', 'contact', 'width=640, height=500, menubar=no, toolbar=no, scrollbars=yes');
}
function try_open() {
window.open('http://www.hello-ldk.com/try/', 'try', 'width=640, height=500, menubar=no, toolbar=no, scrollbars=yes');
}
function event_open() {
window.open('http://www.hello-ldk.com/form/event/', 'event', 'width=640, height=500, menubar=no, toolbar=no, scrollbars=yes');
}