function Is() {
    agent  = navigator.userAgent.toLowerCase();
    this.major = parseInt(navigator.appVersion);
    this.minor = parseFloat(navigator.appVersion);
    this.ns    = ((agent.indexOf('mozilla') != -1) && 
      ((agent.indexOf('spoofer')  ==   -1) && (agent.indexOf('compatible') == -1)));
    this.ns4   = (this.ns && (this.major == 4));
    this.ns6   = (this.ns && (this.major >= 5));
    this.ie    = (agent.indexOf("msie") != -1);
    this.ie3   = (this.ie && (this.major  < 4));
    this.ie4   = (this.ie && (this.major == 4) && (agent.indexOf("msie 5.0") == -1));
    this.ie5   = (this.ie && (this.major == 4) && (agent.indexOf("msie 5.0") != -1));
    this.ie55  = (this.ie && (this.major == 4) && (agent.indexOf("msie 5.5") != -1));
    this.ie6  = (this.ie && (agent.indexOf("msie 6.0")!=-1) );
}

var is = new Is();

function createMarker(point,html) {
    var marker = new GMarker(point);
    GEvent.addListener(marker, "click", function() {
      marker.openInfoWindowHtml("<div class='deftxt'><br/>"+html+"</div>");
    });
    return marker;
}


function getMarks(host) { /* pass url during the call. */
	var url='/googleMapMarks.php?host='+host;
	map.closeInfoWindow(); /*close any InfoWindows that happen to be open  */
	map.clearOverlays();
  	var request = GXmlHttp.create(); /* use the XML methods  */
    	request.open("GET", url, true);
    	request.onreadystatechange = function() {
     	if (request.readyState == 4) {	
		var xmlDoc = request.responseXML; /* php returns 'XML' */
		var markers = xmlDoc.documentElement.getElementsByTagName("marker"); 
		for (var loop1=0;loop1<markers.length;loop1++){
			var lat = parseFloat(markers[loop1].getAttribute("lat"));  /* data is string. */
			var lng = parseFloat(markers[loop1].getAttribute("lng")); 
			var point = new GLatLng(lat,lng);
			var host = markers[loop1].getAttribute("host");
			var loc = markers[loop1].getAttribute("location");
			var marker = createMarker(point,host+" <br/> "+loc);
			map.addOverlay(marker);
			map.panTo(point);
			}
		}
		};
	request.send(null);
}