function cart_add(id, form_data, bike)
{
     if (window.ActiveXObject)
     {
         httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
     }
     else
     {
         httpRequest = new XMLHttpRequest();
     }

     httpRequest.open("POST", "/category_form.php", true);

     var parameters = "id=" + id + "&data=" + encodeURI( form_data ) + "&bike=" + bike;
     httpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
     httpRequest.setRequestHeader("Content-length", parameters.length);
     httpRequest.setRequestHeader("Connection", "close");
     httpRequest.onreadystatechange = function() {
        if (httpRequest.readyState == 4) {
            var elem = document.getElementById("id"+id).innerHTML = httpRequest.responseText;
        }
     };
     httpRequest.send(parameters);
}


function show_form(id){
    
    $('.menicko_'+id).hide();

    $('#menicko_'+id).show();

    return false;
}