use Jquery in Telerik

http://www.telerik.com/help/aspnet-ajax/introduction-using-jquery.html

There are some Telerik Web Controls are using Jquery, Please check those control list via above URL. If you have used any of these web controls in your web page, then you are able to use $telerik.$ to utilize Jquery

3. Using the $telerik.$ alias:

CopyJavaScript

<script type="text/javascript">    $telerik.$(document).ready(function () {        alert("Document is ready");    });</script> 

e.g.:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"    CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %><%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %><asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent"></asp:Content><asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">    <h2>        Welcome to ASP.NET!    </h2>    <p>        To learn more about ASP.NET visit <a href="http://www.asp.net" title="ASP.NET Website">www.asp.net</a>.    </p>    <p>        You can also find <a href="http://go.microsoft.com/fwlink/?LinkID=152368&clcid=0x409"            title="MSDN ASP.NET Docs">documentation on ASP.NET at MSDN</a>.    </p>    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">    </telerik:RadScriptManager>    <telerik:RadComboBox ID="RadComboBox1" runat="server">    </telerik:RadComboBox>    <span id="spantest">abc</span>    <input id="Button2" type="button" value="jquery button" onclick="javascript: alert($telerik.$('#spantest').text())"/>    <input id="Button1" type="button" value="normal button" onclick="javascript: alert(document.getElementById('spantest').innerText)"/></asp:Content>