Sharepoint 2010: Update SPNavigationNode Title

as per my requirement i need to update "Library" node to "Libraries"

Namespace:  Microsoft.SharePoint.Publishing.Navigation
Assembly:  Microsoft.SharePoint.Publishing (in Microsoft.SharePoint.Publishing.dll)

Syntax:

here is the Powershell Script :

public static SPNavigationNode UpdateSPNavigationNode(

         SPNavigationNode node,

         SPNavigationNode previous,

         string name,

         string url,

         string description,

         string target,

         string audience,

         bool forceCreate

)

$webURL="http://servername/sites/P000527/"

$web=Get-SPWeb $webURL

$navigationNode=$web.Navigation.QuickLaunch

$LibraryNode = $navigationNode | where { $_.Title -eq "Library" }

$HomeNode= $navigationHomeNode | where { $_.Title -eq "Home" }

$NewTitle= "Libraries"

[Microsoft.SharePoint.Publishing.Navigation.SPNavigationSiteMapNode]::UpdateSPNavigationNode($LibraryNode, $HomeNode, $NewTitle, $LibraryNode.Url, "", "", "", $false)

$web.Dispose()

Refer this post  for Sharepoint object model :

http://blog.mastykarz.nl/programmatically-configuring-menu-items-sharepoint-2010/