Error using push.js in vb.net

Question

I'm trying to make some browser notifications with push.js library and vb.net

The notification works but my problem is I want multiple notifications at same time, if I need it. the data is taken from my database and usually it'll be more than one data row.

My problem is, it only show one notification

For Each t_dtt_row As DataRow In t_dtt_notificaciones.Rows
            str_url_img = "http://finalbca.16mb.com/homepageimages/notificationicon.png"
            If t_dtt_row("nuevo") Then
                t_str_script = "Push.create('Tienes una nueva notificación', {" & _
                               "body: '" & t_dtt_row("notificacion") & "'," & _
                               "icon: '" & str_url_img & "'," & _
                               "timeout: 6000" & _
                               "}); "
            End If
            ScriptManager.RegisterClientScriptBlock(Page, GetType(Page), "notificar", t_str_script, True)
        Next

I'm using a "for" but I only get one notification this is an example of what I need

Some ideas? if i do it with html or aspx and js and fixded information works but when I include it with vb.net only shows one.