function makeRequest(url,aid) {
	var http_request = false;
	if(window.ActiveXObject) {
	// Explorer
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e) {}
		}
	} else if(window.XMLHttpRequest) {
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) http_request.overrideMimeType('text/xml');
	}
	if (!http_request) {
		alert('Невозможно создать экземпляр класса XMLHTTP ');
		return false;
	}
	http_request.onreadystatechange = function() { alertContents(http_request,aid); };
	http_request.open('GET', url, true);
	http_request.send(null);
}

function In(param,aid) {
  document.getElementById(aid).innerHTML = param;
  if(aid=="shopping_cart_content") {
    alert("Товар добавлен в корзину.");
  } else if((aid=="town_delivery_sum") || (aid=="town_list")) {
    if(aid=="town_list") {
      var town_list = document.getElementById('town_list');
      other_town(town_list.value);
    }
    var continue_button = document.getElementById('continue_button');
    continue_button.disabled = false;
  } else if(aid=="delivery_sum") {
    var cost_of_delivery = document.getElementById('cost_of_delivery');
    change_town_list(cost_of_delivery.value);
  }
}

function alertContents(http_request,aid) {
	if(http_request.readyState == 4) {
		if(http_request.status == 200) {                                                                    
			//alert(http_request.responseText);
			In(http_request.responseText,aid);
		} else {
			alert('С запросом возникла проблема.');
		}
	}
}