使用AJAX提交隐藏数据

I have short form in HTML. This is chat window and I would like to pass there not only user message but also some hidden data to file "post.php" which is in upper folder.

<form name="message" action="">
    <input name="usermsg" type="text" id="usermsg" size="63" />
    <input name="company" type="hidden" id="company" value="<?php echo $kawalki_adres[2]; ?>"/>
    <input name="submitmsg" type="submit"  id="submitmsg" value="Send" />
</form>

Here is AJAX

<script type="text/javascript">
        //If user submits the form
$("#submitmsg").click(function(){   
    var clientmsg = $("#usermsg").val();
    var company = $("#company").val();
    $.post("../post.php", {text: clientmsg, company});              
    $("#usermsg").attr("value", "");
    $("#company").attr("value", "");
    return false;
});

I'm taking user's message correctly in "post.php" but not sure how to receive "company" variable.

Use like this

Make sure you are setting the value of company by PHP

$("#submitmsg").click(function(e){   
    e.preventDefault(); //prevents form submit, otherwise pages gets reloaded
    var clientmsg = $("#usermsg").val();
    var company = $("#company").val();
    $.post("../post.php", {text: clientmsg, company: company});              
    $("#usermsg").attr("value", "");
    $("#company").attr("value", "");
    return false;
});