Use the Snoopy PHP class, you'll LOVE it, I know I do:
http://sourceforge.net/projects/snoopy/
Submitting a form or doing ANYTHING with remote sites is extremely easy and almost everything is built into the class for you.
PHP Code:
//example.php
include("Snoopy.class.php");
$snoopy = new Snoopy();
$submit_url = "http://www.example.com/submit.php";
$snoopy->cookies["username"] = "dangrossman";
$submit_vars["var1"] = 35;
$submit_vars["anotherforminput"] = "$stuff";
$submit_vars["submit1"] = "Confirm";
$snoopy->submit($submit_url,$submit_vars);
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