rem: btn.events.register("mouseup", this, this.stopAction); 
add: btn.events.register("mouseup", this, Event.stop); 
context:     _addButton:function(id, img, activeImg, xy, sz, title) {        var imgLocation = OpenLayers.Util.getImagesLocation() + img;        var activeImgLocation = OpenLayers.Util.getImagesLocation() + activeImg;        // var btn = new ol.AlphaImage("_"+id, imgLocation, xy, sz);        var btn = OpenLayers.Util.createAlphaImageDiv(                                    "OpenLayers_Control_MouseToolbar_" + id,                                     xy, sz, imgLocation, "absolute");        //we want to add the outer div        this.div.appendChild(btn);        btn.imgLocation = imgLocation;        btn.activeImgLocation = activeImgLocation;                btn.events = new OpenLayers.Events(this, btn);        btn.events.register("mousedown", this, this.buttonClick);         btn.events.register("mouseup", this, this.stopAction);         btn.action = id;        btn.title = title;        btn.alt = title;        btn.map = this.map;        //we want to remember/reference the outer div        this.buttons[id] = btn;        return btn;    },
meta: 8310	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8310/c92cd6d88a59f79879c73965c26269e13afa25e3/MouseToolbar.js/clean/lib/OpenLayers/Control/MouseToolbar.js