Need Help with getElementsByTagName F(x)

[admin]

Hello,I have a DOM like:<?xml version="1.0" encoding="UTF-8"?><!-- edited with XML Spy v3.5 NT beta 3 build Dec 21 2000 (<!-- m --><a class="postlink" href="http://www.xmlspy.com">http://www.xmlspy.com</a><!-- m -->)by Zack (Equiva) --><Errors><Tier name="CBO"></Tier><Class name="cboProcessOrder"><method name="GetOrder"><Error/></method></Class><Tier name="CDO"></Tier><Class name="cdoOraDB"><method name="InsertRec"><Error ErrNum="-23456" ErrDesc="ADO Insert Failure" DateTime="1-22-200112:30"/></method></Class></Errors>I want to use the getElementsByTagName F(x) to check to see if aclass Node Exist where Tier name="CDO" or "CBO"I could redesign my XML, by dropping Tier.ThanksZack