Error: 'uncaught error tablesorter is not a function'

Master page:javascript
 <script src="../js/jquery-1.5.2.min.js" type="text/javascript"></script>
	<script src="../js/hideshow.js" type="text/javascript"></script>
	<script src="../js/jquery.tablesorter.min.js" type="text/javascript"></script>
	<script type="text/javascript" src="../js/jquery.equalHeight.js"></script>
	<script type="text/javascript">
	  	    $(document).ready(function () {
	  	        $(".tablesorter").tablesorter();
	    }
	);
</script>

 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
    <script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.9/jquery-ui.js" type="text/javascript"></script>
    <link href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.9/themes/start/jquery-ui.css" rel="stylesheet" type="text/css" />
    
    <script type="text/javascript">
        $("[id*=btnadd]").live("click", function () {
            debugger;
            $("#modal_dialog").dialog({
                title: "Manage Branch",
                autoopen: false,
                width: 500,
                buttons: {
                    ADD: function () {
                        $("[id*=add]").click();
                    },
                    Cancel: function () {
                        $(this).dialog('close');
                    }
                },
                modal: true
            });

            return false;
        });
          </script>

popup calling:
 <div id="modal_dialog" style="display: none">
            <div class="tab_container">
                <div id="tab2" class="tab_content">
                    <table class="tablesorter" cellspacing="0">
                        <tbody>
                            <tr>
                                <td>
                                    <b>ID:
                                        <asp:TextBox ID="TextBox1" runat="server" Style="margin-left: 130px"></asp:TextBox>
                                        <br />
                                        <br />
                                        Branch:
                                        <asp:TextBox ID="TextBox2" runat="server" Style="margin-left: 97px"></asp:TextBox>
                                        <br />
                                        <br />
                                </td>
                            </tr>
                            
                                                                   
                        </tbody>
                   <asp:Button ID="add" runat="server" Text="ADD" style="display:none" OnClick="btninsert_Click"></asp:Button>
                    </table>
                                     
                </div>
                <!-- end of #tab1 -->
            </div>
            <!-- ID -->
        </div>

Backend calling function
 protected void btninsert_Click(object sender, EventArgs e)
        {

            SqlConnection con = new SqlConnection();
            con.ConnectionString = @"Data Source=WINCTRL-TNT3FMR;Initial Catalog=TaxiAPP;Integrated Security=True";
            SqlCommand command = new SqlCommand("Insert into Branch(ID,Branch)values(@ID,@Branch)SELECT SCOPE_IDENTITY()", con);
            con.Open();
            command.Parameters.AddWithValue("@ID", TextBox1.Text);
            command.Parameters.AddWithValue("@Branch", TextBox2.Text);
            command.ExecuteNonQuery();
            con.Close();
}