add: if (!Event.isLeftClick(evt)) return; 
context:     defaultMouseDown: function (evt) {        this.mouseDragStart = evt.xy.copyOf();        this.performedDrag  = false;        if (evt.shiftKey) {            this.map.div.style.cursor = "crosshair";            this.zoomBox = OpenLayers.Util.createDiv('zoomBox',                                                     this.mouseDragStart,                                                     null,                                                     null,                                                     "absolute",                                                     "2px solid red");            this.zoomBox.style.backgroundColor = "white";            this.zoomBox.style.filter = "alpha(opacity=50)"; // IE            this.zoomBox.style.opacity = "0.50";            this.zoomBox.style.zIndex = this.map.Z_INDEX_BASE["Popup"] - 1;            this.map.viewPortDiv.appendChild(this.zoomBox);        }        document.onselectstart=function() { return false; }        Event.stop(evt);    },
meta: 4411	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4411/2b5f13ae0eea826ef41a516d5c3941754bc629f9/MouseDefaults.js/clean/lib/OpenLayers/Control/MouseDefaults.js