Use ajax to refresh page without reload, and in this pages use POST / GET

There are 3 sides, which I'm using Ajax to avoid having to reload the page to refresh. This 3 side content, and js :

Content:

<ul id="nav">
<li><a href="ajax_adat.php?id=8&epul=0">Adatok</a></li>
<li><a href="piac_vasarlas.php?id=8&epul=0">Kereskedelem</a></li>
<li><a href="piac_egyseg_gyartas.php?id=8&epul=0">Egység gyártás</a></li>

Js:

$(document).ready(function () {

$('ul#nav li a').click(function(){
    var page = $(this).attr('href');
    $('#content').load('../views/' + page );
    return false;
});});

All three pages would like to use POST and GET. For example what i like to use: The egyseg_gyartas.php?id=8&epul=0 look like:

...<input type=\"number\" name=\"v_vesz\" min=\"0\" max=\"".$hany["$v[$i]"]["epitheto"]."\" step=\"1\">...
<form action="<?php echo $_SERVER['PHP_SELF'], '?id=' . $id . '&epul=' . $lenneEpulet . '&Pgyart';?>" method="post">
    <input type="submit" name="egyseg_vasarlas" value="Küldés" style="float: left">
    <input type="Button" value="Vissza" onclick="$:location.href='../views/jatek.php'" style="float: left; margin-left: 10px">
</form>

For example the POST :

if( isset($_POST['egyseg_vasarlas']) )
{
    x = $_GET['v_vesz']
    ..... 
}

So how can i use POST if i use this refreshed pages without reload ? In the POST usually have to change the variables which will build on that page . For example, you can buy a wagon ( game ), and if you bought it , int the POST i need to change, now he cant buy 2 wagon, only 1, and i use php functions in POST, etc... .