can you help me with this problem?

I have a xhtml file (file1) that I want clean

I want delete any attribuite "width" in TR tag.

I have write Visual Basic code, but nothing node is select.
This is my VB code :

Dim oNodeList As IXMLDOMNodeList
Dim oNode As IXMLDOMElement

If txtPathFile.Text <> "" Then
xmlDBiz.validateOnParse = False
xmlDBiz.Load (txtPathFile.Text)

Set oNodeList = xmlDBiz.selectNodes("//tr")
If oNodeList.length <> 0 Then
End If
End if

This is my XHTML file:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<?xml-stylesheet type="text/css" href="C:\IlSole24ORE\PROVE_dora\migrazione\_templatenew.xsl"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<meta name="generator" content="HTML Tidy, see www.w3.org"/>
<table class="fascettaLEGGE" border="0">
<td align="left" width="70%" height="40">
<p class="parestremi">Circ. 10 luglio 1979, n.19</p>
<p class="parepigrafe">
<b>Ministero delle

How can I select all <tr> nodes in document?

Thank you for any help.