click button hides sharing icons

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<table>
<tr>
<td colspan="5">
<asp:ImageButton ID="btn_like" runat="server" ToolTip="Like" onclick="btn_like_Click1" OnClientClick="Show('shareicons');" />
<asp:ImageButton ID="btn_favorite" runat="server" ToolTip="Favorite" onclick="btn_favorite_Click1"/>
<asp:ImageButton ID="btn_spam" runat="server" ToolTip="Spam" onclick="btn_spam_Click1"/>                            
</td>
</tr>
                    
<tr>
<td colspan="5">
<span class='st_facebook_large' displayText='Facebook' title="Share this Ad on Facebook"></span>
<span class='st_googleplus_large' displayText='Google +' title="Share this Ad on Google+"></span>
<span class='st_twitter_large' displayText='Tweet' title="Share this Ad on Twitter"></span>
<span class='st_linkedin_large' displayText='LinkedIn' title="Share this Ad on LinkedIn"></span>
<span class='st_email_large' displayText='Email' title="Share this Ad on Email"></span>
<span class='st_sharethis_large' displayText='ShareThis' title="More Sharing Options"></span>
</td>
</tr>
</table>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btn_like" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btn_favorite" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btn_spam" EventName="Click" />
</Triggers>
</asp:UpdatePanel>

protected void btn_like_Click1(object sender, ImageClickEventArgs e)
    {
        if (null == Session["advertise"] || Session["advertise"] == null)
        {
            ScriptManager.RegisterStartupScript(this, typeof(string), "Error", "alert('Please login to Like this Advertisement.');", true);
        }
        else
        {
            ses = Session["advertise"].ToString();
            SqlCommand cmd = new SqlCommand("sps_checklike", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@ad_id", ad_id);
            cmd.Parameters.AddWithValue("@email", ses);
            cmd.Parameters.Add("@ERROR", SqlDbType.Int);
            cmd.Parameters["@ERROR"].Direction = ParameterDirection.Output;
            con.Open();
            cmd.ExecuteNonQuery();
            int s = (int)cmd.Parameters["@ERROR"].Value;
            con.Close();
            if (s == 1)
            {
                
                SqlCommand cmd3 = new SqlCommand("sps_decreaselike", con);
                cmd3.CommandType = CommandType.StoredProcedure;
                cmd3.Parameters.AddWithValue("@ad_id", ad_id);
                cmd3.Parameters.AddWithValue("@email", ses);
                con.Open();
                cmd3.ExecuteNonQuery();
                con.Close();
                btn_like.ImageUrl = "http://localhost:37698/Finder/Images/likeinactive.png";
                LoadDetails();
            }
            else
            {
                
                SqlCommand cmd2 = new SqlCommand("sps_increaselike", con);
                cmd2.CommandType = CommandType.StoredProcedure;
                cmd2.Parameters.AddWithValue("@ad_id", ad_id);
                cmd2.Parameters.AddWithValue("@email", ses);
                con.Open();
                cmd2.ExecuteNonQuery();
                con.Close();
                btn_like.ImageUrl = "http://localhost:37698/Finder/Images/likeactive.png";
                LoadDetails();
            }
        }
    }