Deadlock

Hi,

We are using SQLSentry tool to monitor our DB server. We got below alert.

Environment: SQL Server 2005 Std With SP2 on Windows Server 2003 Ent

Please help why we are getting below deadlock

[Connection]:  abc.xyz.com
[Message]:  SQL Server Deadlock Detected
[Event Time]:  12/22/2012 3:52:10 PM
----------------------------------------------------------------------
[Timestamp (Local)]:  12/22/2012 3:52:10 PM
[Timestamp (UTC)]:  12/22/2012 11:52:10 PM
[Generated By]:  SQL Sentry 7.2 Server [SQLQADB02]
[Version]:  7.2.54.0
[Monitor Type]:  SqlServerProfiler
[Condition]:  SQL Server: Deadlock
[Response Ruleset]:  Notify Every Time (default)
----------------------------------------------------------------------
[Deadlock Victim Information]:
SPID [ecid]: 707 [0]
Host: host15
Application: .Net SqlClient Data Provider
Database: databse01
Login: WebServer
Log Used: 0
Deadlock Priority: 0
Wait Time: 1484
Transaction Start Time: 12/22/2012 3:52:09 PM
Last Batch Start Time: 12/22/2012 3:52:09 PM
Last Batch Completion Time: 12/22/2012 3:52:09 PM
Mode/Type: S
Status: suspended
Isolation Level: read committed (2)
Text Data:
    at databse01.dbo.up_Getads2 line 24
      SELECT
        H.ID as ID,
        H.ParentID as PID,
        RTRIM(REPLACE(REPLACE(REPLACE(H.Subject,'&amp;',  '&'), '&lt;', '<'), '&gt;', '>')) as T,
        dbo.fn_ConvertToXmlDate(H.PostDate) as D,
        RTRIM(REPLACE(REPLACE(REPLACE(H.PreviewText,'&amp;',  '&'), '&lt;', '<'), '&gt;', '>')) as PT,
        CASE
                WHEN Anonymous = 0 THEN RTRIM(U.Handle)
                ELSE 'Anonymous'
        END as A,

        CASE
                WHEN H.PollID = -1 THEN NULL
                ELSE 1
        END as P,

        CASE
                WHEN Status & 163
Client Options 2: 128056
Client Options 1: 538968096
Is Victim: True
Wait Resource: KEY: 5:72057594065518592 (2c00ac28262b)
Transaction Count: 0
Lock Timeout: 4294967295
SPID: 707
ECID: 0
Transaction ID: 423751167
Transaction Name: XML SELECT
Database ID: 5