function edit_bookmark(event) {
    window.open(this.href, 'edit_bookmark', 'width=800,height=250').focus();
    event.preventDefault();
    return false;
}

var bookmark_links = document.querySelectorAll('.edit-bookmark');
for (var i = 0; i < bookmark_links.length; i++) {
    bookmark_links.item(i).addEventListener('click', edit_bookmark);
}