1var win = window.open('http://stackoverflow.com/', '_blank');
2if (win) {
3    //Browser has allowed it to be opened
4    win.focus();
5} else {
6    //Browser has blocked it
7    alert('Please allow popups for this website');
8}

1window.open('http://stackoverflow.com/', '_blank');

1window.open('_link is here_', 'name');