Mass add link to Navigation Pane SharePoint 2010 Power shell

--add a link to navigation pane mass sites

$sites = Get-SPWeb "Site Here"
foreach ($site in $sites.webs)
{
$web = Get-SPWeb $Site.URL
$qlNav = $web.Navigation.QuickLaunch
$qlHeading = $qlNav | where { $_.Title -eq "Libraries" }
$linkNode = New-Object Microsoft.SharePoint.Navigation.SPNavigationNode("Name", "URL", $true)
$qlHeading.Children.AddAsLast($linkNode)
$qlHeading.Update
$web.Update
$web.Dispose
}

enjoy