Hi,
Can anyone help me with the fact that the following code works in FF, but in IE, it generates the error
'lastChild.children' is null or not an object

HTML Code:
    if (GBrowserIsCompatible()) {

      var numbers = [];
      var types = [];
      var prices = [];
	  var polys = [];

      // Display the map, with some controls and set the initial location 
      var map = new GMap2(document.getElementById("map"), { mapTypes:[G_HYBRID_MAP] });
      map.addControl(new GLargeMapControl());
      map.addControl(new GMapTypeControl());
      map.setCenter(new GLatLng(<?php echo $centerlat . ", " . $centerlng ?>),17);

      GEvent.addListener(map, "click", function(overlay,point) {
        var T1 = new Date();
        if (!overlay) {
          for (var i=0; i<polys.length; i++) {
            if (polys[i].Contains(point))  
				{
              var area = polys[i].Area()/* /1000000*/;
              var sqmiles = area/2.58998811;
              var T2 = new Date();
              map.openInfoWindowHtml(point,"This is plot <b>"+numbers[i] + "</b><br>"
			  + "Housetype: <b>" + types[i] + "</b><br>"
			  + "Price is: <b>" + prices[i] + "</b><br>"
			  +"The area of "+numbers[i]+" is "+parseInt(area)+ "sq m" + "<br>"

                   // +".<br>that's "+parseInt(sqmiles)+" square miles<br>"
                   // +"Its boundary is "+parseInt(polys[i].Distance()/1609.344)+" miles long"
                    +"<hr>Time taken = "+(T2.getTime()-T1.getTime())+" milliseconds"
              );             i = 999; // Jump out of loop
            }
          }
        }
      });

      // Read the data from plots.xml
      var request = GXmlHttp.create();
      request.open("GET", "write.xml", true);
      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          var xmlDoc = GXml.parse(request.responseText);
          // ========= Now process the polylines ===========
          var plots = xmlDoc.documentElement.getElementsByTagName("plot");
          // read each line
          for (var a = 0; a < plots.length; a++) {
            // get any state attributes
            //var label  = plots[a].getAttribute("name");
// ISSUE STARTS HERE!!!
            var number  = xmlDoc.lastChild.children[a].children[1].firstChild.nodeValue;
            var type  = xmlDoc.lastChild.children[a].children[3].firstChild.nodeValue;
            var price  = xmlDoc.lastChild.children[a].children[4].firstChild.nodeValue;
// ISSUE ENDS HERE!!!			
            var colour = "#ff0000";
            //var colour = plots[a].getAttribute("colour");
            // read each point on that line
            var points = plots[a].getElementsByTagName("point");
            var pts = [];
            for (var i = 0; i < points.length; i++) {
               pts[i] = new GLatLng(parseFloat(points[i].getAttribute("lat")),
                                   parseFloat(points[i].getAttribute("lng")));
            }
			var opaque =0.25;
			var strokeopacity = 1;
			var strokewidth = 1;
            var poly = new GPolygon(pts,"#000000",strokewidth,strokeopacity,colour,opaque,{clickable:false});
            polys.push(poly);
            numbers.push(number);
            types.push(type);
            prices.push(price);
            map.addOverlay(poly);
          }

          // ================================================           
        }
      }
      request.send(null);
    }
    
    // display a warning if the browser was not compatible
    else {
      alert("Sorry, the Google Maps API is not compatible with this browser");
    }
Thanks