jQuery JS functions does not work Script is added in Master Page in ASP.Net

Hi, I have this code in head section of my masterpage

<script type="text/javascript" src="js/superfish.js"></script>
<script type="text/javascript" src="js/custom.js"></script>
<script type="text/javascript">
    $(function () {
        $('.fadein img:gt(0)').hide();
        setInterval(function () { $('.fadein :first-child').fadeOut().next('img').fadeIn().end().appendTo('.fadein'); }, 4000);
    });
</script>

my masterpage name is main and I have a page it's called Exchange

and I have this code in Exchange.aspx

<%@ Page Title="" Language="C#" MasterPageFile="~/main.master" AutoEventWireup="true" CodeFile="Exchange.aspx.cs" Inherits="Exchange" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
 <link rel="Stylesheet" type="text/css" href="CSS/uploadify.css" />
    
    <script type="text/javascript" src="scripts/jquery.uploadify.js"></script>
    <script src="jscripts/tiny_mce/tiny_mce.js" type="text/javascript"></script>
    <script src="myjs.js" type="text/javascript"></script>
<script type = "text/javascript">
    $(window).load(
    function () {
        $("#<%=FileUpload1.ClientID %>").fileUpload({
            'uploader': 'scripts/uploader.swf',
            

Uploadify doesn't work by code above but when I remove this

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> 


form masterpage and put it in my page (Exchange.aspx)
uploadify starts working.

but the problem is in need jquery library in masterpage too.

is there any solution?