howto login to a php site with vb?

[kakablack]

i have a user and pass and i want to login to site:www.rpl24.com

i using this method:

Dim Dim_Str_Request As String
Dim_Str_Request = "POST /login.php?txtUserId=12345&txtPassword=12345 HTTP/1.1" & vbCrLf
Dim_Str_Request = Dim_Str_Request & "User-Agent: Mozilla/6.0 (compatible; MSIE 6.01; Windows NT)" & vbCrLf
Dim_Str_Request = Dim_Str_Request & "Host: " & WinSck_General.RemoteHost & vbCrLf
Dim_Str_Request = Dim_Str_Request & "Accept: text/html" & vbCrLf
Dim_Str_Request = Dim_Str_Request & "Accept: Accept-Language: en, fa" & vbCrLf
Dim_Str_Request = Dim_Str_Request & "Accept-Charset: iso-8859-1, utf-8, utf-16" & vbCrLf
Dim_Str_Request = Dim_Str_Request & "Accept-Encoding: deflate, gzip, x-gzip, identity" & vbCrLf
Dim_Str_Request = Dim_Str_Request & "Connection: Keep-Alive" & vbCrLf & vbCrLf
Fra_StartOrCreate_TxtBx_Status.Text = "Status: Socket is sending request(Get)..."
WinSck_General.SendData (Dim_Str_Request)

i use this but say invalid user pass
but when i login direct from iexplorer its login prefectly
why?

[kakablack]

anybody please help me