function buy(id) {
    var req = new JsHttpRequest();
    req.loader="FORM";
    req.onreadystatechange = function() {
        if (req.readyState == 4) {
  	    if (req.responseJS.num != null) document.getElementById('basket_num').innerHTML = req.responseJS.num;
  	    if (req.responseJS.summ != null) document.getElementById('basket_summ').innerHTML = req.responseJS.summ;
  	    if (req.responseJS.percent_discounts != null) document.getElementById('percent_discounts').innerHTML = req.responseJS.percent_discounts;
        if (req.responseJS.num != null || req.responseJS.summ != null){document.getElementById('dopdiv').innerHTML="<img src='/shop/images/1/basketok.gif' width='240' height='55' alt='' />"; setTimeout('hide_div()', 1000);}
     }
    }
    req.open("POST", '/shop/buy.php', true);
    req.send({ 'buy': id});
};