x is null or not an object

[Jez D]

I've searched the Internet for a solution to this problem. I'm using
php to extrapolate co-ordinates and data from a mydqldatabase. These
details are then used to populate javascript arrays for plotting on
the map. The javascript arrays are populated fine. However, only the
first set of data in the array is plotted. I get the above error in
IE8 and a slightly different one in FF.

The map is at
http://www.turbowebdesign.net/clients/bighouse/previewproperty2.php?propertyid=39

My code:

<script type="text/javascript">
//<![CDATA[
// Google Map Maker script v.1.1


var map;
var icon0;
var icon1;
var newpoints = new Array();

function addLoadEvent(func) {
        var oldonload = window.onload;
        if (typeof window.onload != 'function'){
                window.onload = func
        } else {
                window.onload = function() {
                        oldonload();
                        func();
                }
        }
}

addLoadEvent(loadMap);
addLoadEvent(addPoints);

function loadMap() {
        map = new GMap2(document.getElementById("map"),{ size: new
GSize(700,400) } );
        map.addControl(new GLargeMapControl());
        map.addControl(new GMapTypeControl());
        map.setCenter(new GLatLng( 53.18895, -2.55132), 15);

        map.setMapType(G_NORMAL_MAP);
        map.enableScrollWheelZoom();


        icon0 = new GIcon();
        icon1 = new GIcon();
        icon0.image = "images/home.png";
        //icon1.image = "images/school.png";
        icon1.image = "http://www.google.com/mapfiles/marker.png";;
        //icon0.shadow = "http://www.google.com/mapfiles/shadow50.png";;
        //icon0.iconSize = new GSize(20, 34);
        icon0.iconSize = new GSize(32, 37);
        icon0.shadowSize = new GSize(37, 34);
        icon0.iconAnchor = new GPoint(9, 34);
        icon0.infoWindowAnchor = new GPoint(9, 2);
        icon0.infoShadowAnchor = new GPoint(18, 25);
}


function addPoints() {

        newpoints[0] = new Array(53.18895, -2.55132, icon0, 'test', '102
Manor Square<br/>Winsford<br/>Cheshire');

                 newpoints[1] = new Array(53.189529, -2.54941, icon1, 'Property 
No.
','<p>Sir John Casss Foundation Primary School</p>');
 newpoints[2] = new Array(53.187649, -2.5491, icon1, 'Property No.
','<p>Thomas Coram Early Childhood Centre</p>');

        for(var i = 0; i < newpoints.length; i++) {
                var point = new GPoint(newpoints[i][1],newpoints[i][0]);
                var popuphtml = newpoints[i][4] ;
                var marker = createMarker(point,newpoints[i][2],popuphtml);
                map.addOverlay(marker);
        }


}

function createMarker(point, icon, popuphtml) {
        var popuphtml = "<div id=\"popup\">" + popuphtml + "<\/div>";
        var marker = new GMarker(point, icon);
        GEvent.addListener(marker, "click", function() {
                marker.openInfoWindowHtml(popuphtml);
        });
        return marker;
}

//]]>
</script>


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