var http_request = false;
var tgt = '';

    function showImages(select) {

        var gaId = select.options[select.options.selectedIndex].value;

        
            makeRequest('showimages.jsp?galid='+gaId, 'mdwin');


    }

    function makeRequest(url, target) {
        tgt = target;
        http_request = false;

        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 = alertContents;
        http_request.open('GET', url, true);
        http_request.send(null);

    }

    function alertContents() {

	if(http_request.readyState == 1){ //Loading

	document.getElementById(tgt).innerHTML = "Lade Bilder...";

	}

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

    }