username / password problem when getting data from website

Hi guys and gals,

I am using the code below to pull data from a website :

Dim curl$
curl = "http://www.checkprice.nl/index.php?a=product_specs&product_id=" & Target.Value

Static oXml As Object
If oXml Is Nothing Then Set oXml = CreateObject("msxml2.xmlhttp")
With oXml
    .Open "GET", curl, False
    .send
Range("C" & Target.Row).Value = .responsetext

End With
Set oXml = Nothing

Exit Sub

However, this website requires a username and password to log in before showing the requested information. Is there any way I can send the username / password along with the request, so it logs in the website and gives me the correct responsetext?
Thanks so much for any help!