<a href="http://www.sait.ru/nashli-tovar-deshevle.html?id=10&title=товар крутой" onclick="window.open(this.href,'','resizable=no,location=no,menubar=no,scrollbars=no,status=no,toolbar= no,fullscreen=no,dependent=no,width=550,height=500,left=200,top=200,status'); return false">Нашли товар дешевле?</a>

<form method="post"  class="forma">
<input name="id"   value="" type="text" />
<input name="title" value="" type="text" />
<input type="submit" name="submit" id="submit" value="Отправить" />
</form>

<form method="post"  class="forma">
<input name="id"   value="<?php echo intval($_GET['id']); ?>" type="text" />
<input name="title" value="<?php echo htmlspecialchars($_GET['title']); ?>" type="text" />
<input type="submit" name="submit" id="submit" value="Отправить" />
</form>