function openStudentEssentials()
{
    var url = 'http://www.toolingu.com/community/images/videos/v6_student_essentials/student_essentials.html';
    var width = 700;
    var height = 600;
    var top = (screen.height - height) / 2;
    var left = (screen.width - width) / 2;
    var features = "screenX=" + left + ",screenY=" + top + ",top=" + top + ",left=" + left + ",width=" + width + ",height=" + height;
    
    window.open(url, "", features);
}