function save_gps_coordinates(shop_id, longitude, latitude) {
   
        var url = "/googleMapsServlet?operation=saveGPScoordinates&shop_id="+shop_id+"&longitude="+longitude+"&latitude="+latitude;
        var req = initRequest();
        req.onreadystatechange = function() {
            if (req.readyState == 4) {
                if (req.status == 200) {
                    parseMessages(req.responseXML);
                } else if (req.status == 204){
                    clearTable();
                }
            }
        };
        req.open("GET", url, true);
        req.send(null);    
}

function get_near_by_shops(shop_id, distance) {
	   
    var url = "/googleMapsServlet?operation=getNearByShops&shop_id="+shop_id+"&distance="+distance;
    var req = initRequest();
    req.onreadystatechange = function() {
        if (req.readyState == 4) {
            if (req.status == 200) {
                parseMessages(req.responseXML);
            } else if (req.status == 204){
                clearTable();
            }
        }
    };
    req.open("GET", url, true);
    req.send(null);    
}

function saveDistance(shop_id_1, shop_id_2, distance) {
	
	var url = "/googleMapsServlet?operation=saveDistance&shop_id_1="+shop_id_1+"&shop_id_2="+shop_id_2+"&distance="+distance;
	var req = initRequest();
	req.onreadystatechange = function() {
		if (req.readyState == 4) {
			if (req.status == 200) {
				parseMessages(req.responseXML);
			} else if (req.status == 204){
				clearTable();
			}
		}
	};
	req.open("GET", url, true);
	req.send(null);    
}