Upload document to folder in document library using powershell

Hi,

How to upload multiple documents/images to a document library/Image library using powershell?

In the library, I have a folder called Images. I want to upload the documents to that folder.

I have checked this: http://get-spscripts.com/2010/07/upload-multiple-files-into-document.html

I have used the below powershell:

function UploadImages($weburl)
{
$docLibraryName = "TestLibrary"
$localFolderPath = "c:\Install\Docs" 

Add-PsSnapin Microsoft.SharePoint.PowerShell -erroraction silentlycontinue 
$web = Get-SPWeb -Identity $webUrl

$docLibrary = $web.Lists[$docLibraryName] 
#Attach to local folder and enumerate through all files
$files = ([System.IO.DirectoryInfo] (Get-Item $localFolderPath)).GetFiles() | ForEach-Object { 

    #Create file stream object from file
    $fileStream = ([System.IO.FileInfo] (Get-Item $_.FullName)).OpenRead()
    $contents = new-object byte[] $fileStream.Length
    $fileStream.Read($contents, 0, [int]$fileStream.Length);
    $fileStream.Close(); 

    write-host "Copying" $_.Name "to" $docLibrary.Title "in" $web.Title "..." 

    #Add file
    $folder = $docLibrary.RootFolder
    $spFile = $folder.Files.Add($folder.Url + "/" + $_.Name, $contents, $true)
    $spItem = $spFile.Item 



Write-Host -f Green "Added Images to ibrary !!!"
}
}

Here the Images are added to the Root folder. How to add to the "Images" folder inside the document library.

Thanks