Child window won't keep focus

Hi all,

I am using javascript to open a window after a button is pressed. Everything about the window works correctly, I am wondering if anyone knows a way to give the child window the focus that is cross browser compatible. Here is the sub I am using:

VB Code:

'used for adding a new contact
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Dim strScript As String
        Dim strFeatures As String
        SupplierInfo.InnerHtml = ""
        ContactInfo.InnerHtml = ""
        LinkButton1.Text = ""
        Linkbutton2.Text = ""
        cmbContact.Items.Clear()
        If cmbSupplier.SelectedIndex = 0 Then
            MessageBox.Show("Please choose a supplier before adding a new contact", _
            "Supplier Needed", MessageBoxButtons.OK, MessageBoxIcon.Error, _
            MessageBoxDefaultButton.Button1, MessageBoxOptions.ServiceNotification)
        Else
            strFeatures = "'left=100,top=50,menubar=no,height=750,width=600,resizable=yes,"
            strFeatures += "scrollbars=no,titlebar=yes,toolbar=no'"
            strScript = "<script language=javascript>"
            strScript += "window.open('Contact.aspx?ContactID=0&SupplierID=" _
            + cmbSupplier.SelectedItem.Value + "','Add New Contact'," & strFeatures & ") "
            strScript += ";window.focus('Add New Contact')</script>"
            Response.Write(strScript)
        End If
    End Sub