$ftp="ftp://1.2.3.4.5/air"
$user="account"
$pass="password"
$profile="c:\profile"
$webclient = New-Object System.Net.WebClient
$webclient.Credentials = New-Object System.Net.NetworkCredential($user,$pass)

$uploadfiles=Get-ChildItem $uploadfolder |?{!$_.PSIsContainer }|Sort-Object LastAccessTime,name -Descending |Select-Object -First 5|select -ExpandProperty  fullname
foreach($item in $UPLOADFILES){
    "Uploading $item..."
    $name=$item
    $name=[System.Uri]::EscapeDataString($name)
    $uri = New-Object System.Uri($ftp+"/"+$name+"")
    $webclient.UploadFile($uri, $item)
 }