//script.php
<?

if (@!$_POST['go']):
echo <<<__FORM__
<form action="www.server.ru/other_script.php" method="POST">
<input type="text" name="name">
<input type="submit" name ="go">
</form>
__FORM__;
endif;
?>

//other_script.php
<?
echo $_REQUEST['name'];
?>