OpenLayers.Marker.GPS = OpenLayers.Class(OpenLayers.Marker, {

    /**
     * Property: label
     * {String} Marker label.
     */
    label: "",

    markerDiv: null,

    initialize: function(lonlat, icon, label) {
        OpenLayers.Marker.prototype.initialize.apply(this, [lonlat, icon]);
        this.markerDiv = OpenLayers.Util.createDiv();
       
        this.markerDiv.appendChild(this.icon.imageDiv);
        var txtDiv = OpenLayers.Util.createDiv();
        txtDiv.className = 'gpsMarkerLabel';
        OpenLayers.Util.modifyDOMElement(txtDiv, null, new
        OpenLayers.Pixel(0, this.icon.size.h));
        
        //txtDiv.appendChild(document.createTextNode(label))
        //this.markerDiv.appendChild(txtDiv);
        this.markerDiv.appendChild(txtDiv);
        txtDiv.innerHTML = label;
    },

    /**
     * Method: destroy
     * Nullify references and remove event listeners to prevent circular
     * references and memory leaks
     */
    destroy: function() {
        OpenLayers.Marker.prototype.destroy.apply(this, arguments);
        this.markerDiv.innerHTML = "";
        this.markerDiv = null;
    },

    draw: function(px) {
        OpenLayers.Util.modifyAlphaImageDiv(this.icon.imageDiv,
                                            null,
                                            null,
                                            this.icon.size,
                                            this.icon.url);

        OpenLayers.Util.modifyDOMElement(this.markerDiv, null, px);

        return this.markerDiv;
    },

    redraw: function(px) {
        if ((px != null) && (this.markerDiv != null)) {
            OpenLayers.Util.modifyDOMElement(this.markerDiv, null, px);
        }
    },

    moveTo: function (px) {
        this.redraw(px);
        this.lonlat = this.map.getLonLatFromLayerPx(px);
    },

    isDrawn: function() {
        // nodeType 11 for ie, whose nodes *always* have a parentNode
        // (of type document fragment)
        var isDrawn = (this.markerDiv && this.markerDiv.parentNode &&
                       (this.markerDiv.parentNode.nodeType != 11));

        return isDrawn;
    },

    CLASS_NAME: "OpenLayers.Marker.GPS"
});