LinkButton color change not working while using UpdatePanel in ASP.Net

hi

I use below code that when I go on image, linkbutton's color will change:

  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script type="text/javascript">
        $(function () {
 
            $('.imgstorePT').hover(function () {
                $('.payam4').css('color', 'white');
            });
            $('.imgstorePT').mouseleave(function () {
                $('.payam4').css('color', '');
            });
        });
    </script>
      <script type="text/javascript">
        $(function () {
 
            $('.imgsmsP2').hover(function () {
                $('.payam3').css('color', 'white');
            });
            $('.imgsmsP2').mouseleave(function () {
                $('.payam3').css('color', '');
            });
        });
    </script>
      <script type="text/javascript">
        $(function () {
 
            $('.imgstoreP').hover(function () {
                $('.payam').css('color', 'white');
            });
            $('.imgstoreP').mouseleave(function () {
                $('.payam').css('color', '');
            });
        });
    </script>

as you see in above code there are 3 image and 3 linkbutton that I define...

it works correctly and I put 3 Dropdownlist in page and put them into updatepanel:

<div id="AmFoD2">
    <asp:UpdatePanel ID="upT" runat="server">
        <ContentTemplate>
            <asp:DropDownList ID="Ddlmetraj" runat="server" CssClass="ddlmet">
            </asp:DropDownList>
        </ContentTemplate>
    </asp:UpdatePanel>
    <div id="AmFoD21">
        <asp:UpdatePanel ID="UpdatePanel5" runat="server">
            <ContentTemplate>
                <asp:DropDownList ID="Ddlvagozari" runat="server" CssClass="ddlvag" AutoPostBack="true"
                    OnSelectedIndexChanged="ddlTran_OSIC">
                </asp:DropDownList>
            </ContentTemplate>
        </asp:UpdatePanel>
        <asp:UpdatePanel ID="UpTran" runat="server">
            <ContentTemplate>
                <asp:DropDownList ID="Ddltype" runat="server" CssClass="ddltype" OnSelectedIndexChanged="ddltype_OSIC"
                    AutoPostBack="true">
                </asp:DropDownList>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
</div>

problem is that when I select Item from dropdownlist java codes doesn't work(codes for image and linkbutton)

can you help me?

Best regards

neda