Modal runs after page load .

Hi everyone, 
I need help here , It seems I missed something , when page loaded , the modal activated , and I cannot do anything .
I need to activate it (Modal ) only on some events , not all post back events.

Please help .
Thanks in advance :) 
below is my code : 

<pre>    <style type="text/css">
        .menu
        {
            font-weight: 700;
        }
        .menu
        {
            font-family: Arial;
        }
        .menu
        {
            font-size: medium;
        }
        .style1
        {
            color: #FFFFFF;
        }
        .auto-style1 {
            color: #FFFFFF;
            font-size: large;
        }
    </style>
     <style type="text/css">
        .modal {
            position: fixed;
            top: 0;
            left: 0;
            background-color: black;
            z-index: 99;
            opacity: 0.8;
            filter: alpha(opacity=80);
            -moz-opacity: 0.8;
            min-height: 100%;
            width: 100%;
        }

        .loading {
            font-family: Arial;
            font-size: 10pt;
            border: 5px solid #67CFF5;
            width: 200px;
            height: 100px;
            display: none;
            position: fixed;
            background-color: White;
            z-index: 999;
        }
    </style>

<pre>         <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    function ShowProgress() {
        setTimeout(function () {
            var modal = $('<div />');
            modal.addClass("modal");
            $('body').append(modal);
            var loading = $(".loading");
            loading.show();
            var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
            var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
            loading.css({ top: top, left: left });
        }, 200);
    }
    $('form').live("submit", function () {
        ShowProgress();
    });
</script>

Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load

    If IsPostBack = False Then
        Dim script As String = "$(document).ready(function () { $('[id*=bttAdd]').click(); });"
        Page.ClientScript.RegisterStartupScript(Me.GetType(), "load", script, True)
    End If



End Sub

If IsPostBack = False Then
          Dim script As String = "$(document).ready(function () { $('[id*=bttAdd]').click(); });"
          Page.ClientScript.RegisterStartupScript(Me.GetType(), "load", script, True)
      End If