canvas_elem.addEventListener("mouseup", canvas_clicked, false);

function canvas_clicked(event) {
    var x = m_mouse.get_coords_x(event);
    var y = m_mouse.get_coords_y(event);
    var obj = m_scenes.pick_object(x, y);
    if (obj) {
        switch(m_scenes.get_object_name(obj)) {
        case "Cube":
            window.open("https://www.blend4web.com/");
            break;
        case "Suzanne":
            window.open("https://www.blender.org/");
            break;
        default:
            console.log("Some other selectable object clicked");
        }
    }
}