This code copy server-side...
protected void Page_Load(object sender, EventArgs e)
{
Section8.Visible = false;
Section9.Visible = false;
}
protected void but_Submit_Click(object sender, EventArgs e)
{
Section7.visible = false;
Section8.Visible = true;
}
protected void Button6_Click(object sender, EventArgs e)
{
Section7.visible = false;
Section9.Visible = true;
}