Appending a value into a string

If $iIndex <> -1 Then
        $SiteID = $aListing[$iIndex][1]&"-FS01"  ; append server ID to get the valid local server name
Else

FileCopy("\\ <$SiteID goes here> \KLSHARE\PkgInst\NetAgent_10.0.3361_KES_10.1.0.867\setup.exe", "C:\", 1)

FileCopy("\\"&SiteID,"\KLSHARE\PkgInst\NetAgent_10.0.3361_KES_10.1.0.867\setup.exe", "C:\", 1)