jQuery not finding control id's

[while(!success)]

Hey guys,

I've been tearing my hair out for some time trying to figure out why my jquery has suddenly stopped working. The
jquery script that I have written is fairly simple:

$(document).ready(function () {
    $("#pTab").addClass("active");

    $("#pBtn").click(function () {
        $("#pTab").addClass("active");
        $("#gTab").removeClass("active");
    });

    $("#gBtn").click(function () {
        $("#gTab").addClass("active");
        $("#pTab").removeClass("active");
    });
});

I reference this file as such:

<%@ Page Title="" Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="project.Default" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <script type="text/javascript" src="Scripts/CustomScripts/Default.js"></script>
    <title> Home </title>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="body" runat="server">
    <div class="containerCustom">
        <ul class="navCustom nav-tabsCustom">
            <li id="pTab" runat="server">
                <a id="pBtn" runat="server" href="#">Tab 1</a>
            </li>
            <li id="gTab" runat="server">
                <a id="gBtn" runat="server" href="#">Tab 2</a>
            </li>
        </ul>
    </div>
</asp:Content>

There are no errors when parsing firebug and the thing that really throws me off is that I have jquery working fine on a different page for the same project. I've doubled checked my file path for the js file and double checked the id's. I have no idea what else it could be, if you could help it would be much appreciated. Thank you for your time and help regarding this matter.

[pritaeas]

IIRC: Check out the source of the page after it's generated. You'll see that the ID's have changed values.

[JorgeM]

On ASP.NET controls, if you do not want for ASP.NET to generate unique control IDs, you can set the attribute on your web controls: ClientIdMode=Static

[while(!success)]

I am aware that .NET generates GUID's for controls, doing something like "input[id$='pBtn']" still doesn't generate desired results. Any other suggestions guys? I'm totally stumped.

[pritaeas]

The simple work-around (even though JorgeM's solution is correct), use class instead of id.

[while(!success)]

Thank you guys, I found the problem. I had to remove the runat=server attributes on the non-asp controls and everything works now! Thank you so much.