sir,in my jquery application autocontrol is not working properly and when it works for seperate pages but not working at master child -pages,,,,,

sir,in my jquery application autocontrol is not working properly and when it works for seperate pages but not working at master child -pages,,,,,

this page is( Sign_Up.aspx)
<asp:Content ID="ContentMid" ContentPlaceHolderID="ContentMain" runat="Server">
 <script type="text/javascript">

    $(document).ready(function () {
        SearchText();
    });
    function SearchText() {
        
        $(".autosuggest").autocomplete({
            source: function (request, response) {
                $.ajax({
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    url: "Sign_Up.aspx/GetAutoCompleteData",

                    data: "{'university':'" + document.getElementById('txtuniv_name').value + "'}",
                    dataType: "json",
                    success: function (data) {
                        response(data.d);
                    },
                    error: function (result) {
                        alert("Error");
                    }
                });
            }
        });
    }
    </script>
 <div class="middle-wrapper-signup">
        <div class="left-box-signup">
            <!-- ----------------------------------------------------- -->
            <div class="contact_form" action="#" method="post" name="contact_form" runat="server">
                <ul>
                    <!-- <li>
             <h2>Contact Us</h2>
    <li>
        

                        <asp:Label for="univ_name" CssClass="label" runat="server" >University Name:</asp:Label>
                        <asp:TextBox ID="txtuniv_name" CssClass="text" runat="server"  class="autosuggest"
                            placeholder="IIT" />
                    </li>
                   
</asp:Content>




Masterpage.master

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Notnull.master.cs" Inherits="notnull" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>NotNull</title>
    <!--[if IE]><link href="CSS/.css" rel="stylesheet" type="text/css">
<![endif]-->
    <link href="../Styles/style.css" rel="stylesheet" type="text/css" />
    <script src="../Scripts/tabcontent.js" type="text/javascript"></script>
    <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"></script> 
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery.ui.autocomplete.js" type="text/javascript"></script>