Clusterer = function ( map )
    {
    this.map = map;
    this.markers = [];
    this.clusters = [];
    this.timeout = null;
    this.currentZoomLevel = map.getZoom();

    this.maxVisibleMarkers = Clusterer.defaultMaxVisibleMarkers;
    this.gridSize = Clusterer.defaultGridSize;
    this.minMarkersPerCluster = Clusterer.defaultMinMarkersPerCluster;
    this.maxLinesPerInfoBox = Clusterer.defaultMaxLinesPerInfoBox;
    this.icon = Clusterer.defaultIcon;

    GEvent.addListener( map, 'zoomend', Clusterer.MakeCaller( Clusterer.Display, this ) );
    GEvent.addListener( map, 'moveend', Clusterer.MakeCaller( Clusterer.Display, this ) );
    GEvent.addListener( map, 'infowindowclose', Clusterer.MakeCaller( Clusterer.PopDown, this ) );
    
    this.toolTip = document.getElementById('dhtmltooltip');
    this.map.getPane(G_MAP_FLOAT_PANE).appendChild(this.toolTip);
    this.toolTip.style.visibility="hidden";
   
    };


Clusterer.defaultMaxVisibleMarkers = 100;
Clusterer.defaultGridSize = 5;
Clusterer.defaultMinMarkersPerCluster = 5;
Clusterer.defaultMaxLinesPerInfoBox = 10;

Clusterer.defaultIcon = new GIcon();
Clusterer.defaultIcon.image = 'images/blue_large.PNG';
//Clusterer.defaultIcon.shadow = 'images/shadow_large.PNG';
Clusterer.defaultIcon.iconSize = new GSize( 30, 51 );
Clusterer.defaultIcon.shadowSize = new GSize( 56, 51 );
Clusterer.defaultIcon.iconAnchor = new GPoint( 13, 34 );
Clusterer.defaultIcon.infoWindowAnchor = new GPoint( 13, 3 );
Clusterer.defaultIcon.infoShadowAnchor = new GPoint( 27, 37 );


// Call this to change the cluster icon.
Clusterer.prototype.SetIcon = function ( icon )
    {
    this.icon = icon;
    };


// Changes the maximum number of visible markers before clustering kicks in.
Clusterer.prototype.SetMaxVisibleMarkers = function ( n )
    {
    this.maxVisibleMarkers = n;
    };


// Sets the minumum number of markers for a cluster.
Clusterer.prototype.SetMinMarkersPerCluster = function ( n )
    {
    this.minMarkersPerCluster = n;
    };


// Sets the maximum number of lines in an info box.
Clusterer.prototype.SetMaxLinesPerInfoBox = function ( n )
    {
    this.maxLinesPerInfoBox = n;
    };


// Call this to add a marker.
Clusterer.prototype.AddMarker = function ( marker, title )
    {
    if ( marker.setMap != null )
	marker.setMap( this.map );
    
    marker.title = title;
    marker.onMap = false;
    this.markers.push( marker );
    this.DisplayLater();
    };


// Call this to remove a marker.
Clusterer.prototype.RemoveMarker = function ( marker )
{
    for ( var i = 0; i < this.markers.length; ++i )
	    if ( this.markers[i] == marker )
	    {
	        if ( marker.onMap )	    
		        this.map.removeOverlay( marker );
	        for ( var j = 0; j < this.clusters.length; ++j )
		    {
		        var cluster = this.clusters[j];
		        if ( cluster != null )
		        {
		            for ( var k = 0; k < cluster.markers.length; ++k )
			            if ( cluster.markers[k] == marker )
			            {
			                cluster.markers[k] = null;
			                --cluster.markerCount;
			                break;
			            }
		            if ( cluster.markerCount == 0 )
			        {
			            this.ClearCluster( cluster );
			            this.clusters[j] = null;
			        }
		            else if ( cluster == this.poppedUpCluster )
			            Clusterer.RePop( this );
		        }
		    }
	        this.markers[i] = null;
	        break;
	    }
    this.DisplayLater();
};


Clusterer.prototype.DisplayLater = function ()
{
    if ( this.timeout != null )
	    clearTimeout( this.timeout );	
    this.timeout = setTimeout( Clusterer.MakeCaller( Clusterer.Display, this ), 500 );
};


Clusterer.Display = function ( clusterer )
{
    var i, j, marker, cluster;

    clearTimeout( clusterer.timeout );

    var newZoomLevel = clusterer.map.getZoom();
    
    if(newZoomLevel == 17)// 17 Max Zoomin    
        clusterer.minMarkersPerCluster=3000;
    else    
        clusterer.minMarkersPerCluster=5;        
    
    if ( newZoomLevel != clusterer.currentZoomLevel )
	{
	    // When the zoom level changes, we have to remove all the clusters.
	    for ( i = 0; i < clusterer.clusters.length; ++i )
	        if ( clusterer.clusters[i] != null )
	        {
		        clusterer.ClearCluster( clusterer.clusters[i] );
		        clusterer.clusters[i] = null;
	        }
	    clusterer.clusters.length = 0;
	    clusterer.currentZoomLevel = newZoomLevel;
	}

    // Get the current bounds of the visible area.
    var bounds = clusterer.map.getBounds();

    // Expand the bounds a little, so things look smoother when scrolling
    // by small amounts.
    var sw = bounds.getSouthWest();
    var ne = bounds.getNorthEast();
    var dx = ne.lng() - sw.lng();
    var dy = ne.lat() - sw.lat();
    if ( dx < 300 && dy < 150 )
	{
	    dx *= 0.10;
	    dy *= 0.10;
	    bounds = new GLatLngBounds(
	    new GLatLng( sw.lat() - dy, sw.lng() - dx ),
	    new GLatLng( ne.lat() + dy, ne.lng() + dx ) );
	}

    // Partition the markers into visible and non-visible lists.
    var visibleMarkers = [];
    var nonvisibleMarkers = [];
    for ( i = 0; i < clusterer.markers.length; ++i )
	{
	    marker = clusterer.markers[i];
	    if ( marker != null )
	        if ( bounds.contains( marker.getPoint() ) )
		        visibleMarkers.push( marker );
	        else
		        nonvisibleMarkers.push( marker );
	}

    // Take down the non-visible markers.
    for ( i = 0; i < nonvisibleMarkers.length; ++i )
	{
	    marker = nonvisibleMarkers[i];
	    if ( marker.onMap )
	    {
	        clusterer.map.removeOverlay( marker );
	        marker.onMap = false;
	    }
	}

    // Take down the non-visible clusters.
    for ( i = 0; i < clusterer.clusters.length; ++i )
	{
	    cluster = clusterer.clusters[i];
	    if ( cluster != null && ! bounds.contains( cluster.marker.getPoint() ) && cluster.onMap )
	    {
	        clusterer.map.removeOverlay( cluster.marker );
	        cluster.onMap = false;
	    }
	}

    // Clustering!  This is some complicated stuff.  We have three goals
    // here.  One, limit the number of markers & clusters displayed, so the
    // maps code doesn't slow to a crawl.  Two, when possible keep existing
    // clusters instead of replacing them with new ones, so that the app pans
    // better.  And three, of course, be CPU and memory efficient.
    if ( visibleMarkers.length > clusterer.maxVisibleMarkers )
	{
	// Add to the list of clusters by splitting up the current bounds
	// into a grid.
	    var latRange = bounds.getNorthEast().lat() - bounds.getSouthWest().lat();
	    var latInc = latRange / clusterer.gridSize;
	    var lngInc = latInc / Math.cos( ( bounds.getNorthEast().lat() + bounds.getSouthWest().lat() ) / 2.0 * Math.PI / 180.0 );
	    for ( var lat = bounds.getSouthWest().lat(); lat <= bounds.getNorthEast().lat(); lat += latInc )
	        for ( var lng = bounds.getSouthWest().lng(); lng <= bounds.getNorthEast().lng(); lng += lngInc )
		    {
		        cluster = new Object();
		        cluster.clusterer = clusterer;
		        cluster.bounds = new GLatLngBounds( new GLatLng( lat, lng ), new GLatLng( lat + latInc, lng + lngInc ) );
		        cluster.markers = [];
		        cluster.markerCount = 0;
		        cluster.onMap = false;
		        cluster.marker = null;
		        clusterer.clusters.push( cluster );
		    }

	    // Put all the unclustered visible markers into a cluster - the first
	    // one it fits in, which favors pre-existing clusters.
	    for ( i = 0; i < visibleMarkers.length; ++i )
	    {
	        marker = visibleMarkers[i];
	        if ( marker != null && ! marker.inCluster )
		    {
		        for ( j = 0; j < clusterer.clusters.length; ++j )
		        {
		            cluster = clusterer.clusters[j];
		            if ( cluster != null && cluster.bounds.contains( marker.getPoint() ) )
			        {
			            cluster.markers.push( marker );
			            ++cluster.markerCount;
			            marker.inCluster = true;
			        }
		        }
		    }
        }

	    // Get rid of any clusters containing only a few markers.
	    for ( i = 0; i < clusterer.clusters.length; ++i )
	        if ( clusterer.clusters[i] != null && clusterer.clusters[i].markerCount < clusterer.minMarkersPerCluster )
		    {
		        clusterer.ClearCluster( clusterer.clusters[i] );
		        clusterer.clusters[i] = null;
		    }

	    // Shrink the clusters list.
	    for ( i = clusterer.clusters.length - 1; i >= 0; --i )
	        if ( clusterer.clusters[i] != null )
		        break;
	        else
		        --clusterer.clusters.length;

	    // Ok, we have our clusters.  Go through the markers in each
	    // cluster and remove them from the map if they are currently up.
	    for ( i = 0; i < clusterer.clusters.length; ++i )
	    {
	        cluster = clusterer.clusters[i];
	        if ( cluster != null )
		    {
		        for ( j = 0; j < cluster.markers.length; ++j )
		        {
    		        marker = cluster.markers[j];
	        	    if ( marker != null && marker.onMap )
		        	{
		        	    clusterer.map.removeOverlay( marker );
	    		        marker.onMap = false;
    			    }
		        }
		    }
	    }

	    // Now make cluster-markers for any clusters that need one.
	    for ( i = 0; i < clusterer.clusters.length; ++i )
	    {
	        cluster = clusterer.clusters[i];
	        if ( cluster != null && cluster.marker == null )
		    {
		        // Figure out the average coordinates of the markers in this
		        // cluster.
		        var xTotal = 0.0, yTotal = 0.0;
		        for ( j = 0; j < cluster.markers.length; ++j )
		        {
		            marker = cluster.markers[j];
		            if ( marker != null )
    	    		{
	    	        	xTotal += ( + marker.getPoint().lng() );
    	        		yTotal += ( + marker.getPoint().lat() );
	    		    }
    		    }
    	    	var location = new GLatLng( yTotal / cluster.markerCount, xTotal / cluster.markerCount );
	    	    marker = new GMarker( location, { icon: clusterer.icon } );
    	    	cluster.marker = marker;		
	    	    GEvent.addListener( marker, 'click', Clusterer.MakeCaller( Clusterer.PopUp, cluster ) );
    	    	GEvent.addListener( marker, 'mouseover', Clusterer.MakeCaller( Clusterer.ClustererShowToolTip, cluster) );
	    	    GEvent.addListener(marker, 'mouseout', Clusterer.MakeCaller( Clusterer.HideToolTip, cluster ) );		
    		}
	    }
	}

    // Display the visible markers not already up and not in clusters.
    for ( i = 0; i < visibleMarkers.length; ++i )
	{
	    marker = visibleMarkers[i];
	    if ( marker != null && ! marker.onMap && ! marker.inCluster )
	    {
	        clusterer.map.addOverlay( marker );
	        if ( marker.addedToMap != null )
		        marker.addedToMap();
	        marker.onMap = true;
	    }
	}

    // Display the visible clusters not already up.
    for ( i = 0; i < clusterer.clusters.length; ++i )
	{
	    cluster = clusterer.clusters[i];
	    if ( cluster != null && ! cluster.onMap && bounds.contains( cluster.marker.getPoint() ) )
	    {
	        clusterer.map.addOverlay( cluster.marker );
	        cluster.onMap = true;
	    }
	}

    // In case a cluster is currently popped-up, re-pop to get any new
    // markers into the infobox.
    Clusterer.RePop( clusterer );
};
   
   
Clusterer.HideToolTip = function ( cluster )
{
    clusterer.toolTip.style.visibility="hidden";
}
   

Clusterer.ClustererShowToolTip = function ( cluster)
{   
    var clusterer = cluster.clusterer;
    clusterer.toolTip.innerHTML = cluster.markerCount + " Records";
	var point = clusterer.map.getCurrentMapType().getProjection().fromLatLngToPixel(clusterer.map.fromDivPixelToLatLng(new GPoint(0,0),true),clusterer.map.getZoom());
	var offset = clusterer.map.getCurrentMapType().getProjection().fromLatLngToPixel(cluster.marker.getPoint(),clusterer.map.getZoom());
	var anchor = cluster.marker.getIcon().iconAnchor;
	var width = cluster.marker.getIcon().iconSize.width;
	var height = clusterer.toolTip.clientHeight;
	var pos = new GControlPosition(G_ANCHOR_TOP_LEFT, new GSize(offset.x - point.x - anchor.x + width, offset.y - point.y -anchor.y -height)); 
	pos.apply(clusterer.toolTip);
	clusterer.toolTip.style.visibility="visible";
	
//	
//	var label = new ELabel(location,"Count : " + cluster.markerCount, "	background-color:White",new GSize(3,-20));  
//    map.addOverlay(label);s

}

Clusterer.PopUp = function ( cluster )
    {    
    
    var clusterer = cluster.clusterer;
    clusterer.toolTip.style.visibility="hidden";
    clusterer.map.setZoom( clusterer.map.getZoom()+1);
    
      
//    var clusterer = cluster.clusterer;
//    var html = '<table width="300">';
//    var n = 0;
//    for ( var i = 0; i < cluster.markers.length; ++i )
//	{
//	var marker = cluster.markers[i];
//	if ( marker != null )
//	    {
//	    ++n;
//	    html += '<tr><td>';
//	    if ( marker.getIcon().smallImage != null )
//		html += '<img src="' + marker.getIcon().smallImage + '">';
//	    else
//		html += '<img src="' + marker.getIcon().image + '" width="' + ( marker.getIcon().iconSize.width / 2 ) + '" height="' + ( marker.getIcon().iconSize.height / 2 ) + '">';
//	    html += '</td><td>' + marker.title + '</td></tr>';
//	    if ( n == clusterer.maxLinesPerInfoBox - 1 && cluster.markerCount > clusterer.maxLinesPerInfoBox  )
//		{
//		html += '<tr><td colspan="2">...and ' + ( cluster.markerCount ) + ' more</td></tr>';
//		break;
//		}
//	    }
//	}
//    html += '</table>';
//    clusterer.map.closeInfoWindow();
//    cluster.marker.openInfoWindowHtml( html );
//    clusterer.poppedUpCluster = cluster;
    };


Clusterer.RePop = function ( clusterer )
    {
    if ( clusterer.poppedUpCluster != null )
	Clusterer.PopUp( clusterer.poppedUpCluster );
    };


Clusterer.PopDown = function ( clusterer )
{
    clusterer.poppedUpCluster = null;
};


Clusterer.prototype.ClearCluster = function ( cluster )
{
    var i, marker;

    for ( i = 0; i < cluster.markers.length; ++i )
	if ( cluster.markers[i] != null )
	{
	    cluster.markers[i].inCluster = false;
	    cluster.markers[i] = null;
	}
    cluster.markers.length = 0;
    cluster.markerCount = 0;
    if ( cluster == this.poppedUpCluster )
	this.map.closeInfoWindow();
    if ( cluster.onMap )
	{
	    this.map.removeOverlay( cluster.marker );
	    cluster.onMap = false;
	}
};


// This returns a function closure that calls the given routine with the
// specified arg.
Clusterer.MakeCaller = function ( func, arg )
{
    return function () { func( arg ); };
};


// Augment GMarker so it handles markers that have been created but
// not yet addOverlayed.

GMarker.prototype.setMap = function ( map )
{
    this.map = map;
};

GMarker.prototype.addedToMap = function ()
    {
    this.map = null;
    };

GMarker.prototype.origOpenInfoWindow = GMarker.prototype.openInfoWindow;
GMarker.prototype.openInfoWindow = function ( node, opts )
    {
    if ( this.map != null )
	return this.map.openInfoWindow( this.getPoint(), node, opts );
    else
	return this.origOpenInfoWindow( node, opts );
    };

GMarker.prototype.origOpenInfoWindowHtml = GMarker.prototype.openInfoWindowHtml;
GMarker.prototype.openInfoWindowHtml = function ( html, opts )
    {
    if ( this.map != null )
	return this.map.openInfoWindowHtml( this.getPoint(), html, opts );
    else
	return this.origOpenInfoWindowHtml( html, opts );
    };

GMarker.prototype.origOpenInfoWindowTabs = GMarker.prototype.openInfoWindowTabs;
GMarker.prototype.openInfoWindowTabs = function ( tabNodes, opts )
    {
    if ( this.map != null )
	return this.map.openInfoWindowTabs( this.getPoint(), tabNodes, opts );
    else
	return this.origOpenInfoWindowTabs( tabNodes, opts );
    };

GMarker.prototype.origOpenInfoWindowTabsHtml = GMarker.prototype.openInfoWindowTabsHtml;
GMarker.prototype.openInfoWindowTabsHtml = function ( tabHtmls, opts )
    {
    if ( this.map != null )
	return this.map.openInfoWindowTabsHtml( this.getPoint(), tabHtmls, opts );
    else
	return this.origOpenInfoWindowTabsHtml( tabHtmls, opts );
    };

GMarker.prototype.origShowMapBlowup = GMarker.prototype.showMapBlowup;
GMarker.prototype.showMapBlowup = function ( opts )
    {
    if ( this.map != null )
	return this.map.showMapBlowup( this.getPoint(), opts );
    else
	return this.origShowMapBlowup( opts );
    };