POST Method Question

I'm making a little web browser, but i have a question now..

To send GET variables it's easy..
writeline TCP,"GET Http://server.com.br/file.php?var=1 HTTP/1.0"

But when i need to send POST variables.. how i can make it?

Something like this?
writeline TCP,"POST Http://server.com.br/file.php?var=1 HTTP/1.0"

I found it..

If somebody need to know..

something like this
pexe.infinitehost.com.br
POST http://pexe.infinitehost.com.br/truco/update/ HTTP/1.0
From: aaa@...
Content-Type: application/x-www-form-urlencoded
Content-Length: 6

pexe=p

here's a further example:
http://www.blitzbasic.com/codearcs/codearcs.php?code=1278