function makeMainMenu() {
		var http_request = false;
		var url='geo_principle_menu.php';
		// document.getElementById("list").style.display='none';
		// document.getElementById("edit").style.display='block';

        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
                // See note below about this line
            }
        } else if (window.ActiveXObject) { // IE
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }

        if (!http_request) {
            alert('Giving up :( Cannot create an XMLHTTP instance');
            return false;
        }
        http_request.onreadystatechange = function() { GetMainMenu(http_request); };
        http_request.open('GET', url, true);
        http_request.send(null);

    }

    function GetMainMenu(http_request) {

        if (http_request.readyState == 4) {
            if (http_request.status == 200) {
				 		document.getElementById("menu").innerHTML=http_request.responseText;
               
            } else {
                alert('There was a problem with the request.');
            }
        }

    }