SP: JavaScript to snatch "+ Add new" in calendar

<script type="text/javascript">
function updateCal(){
    if(typeof SP.UI.ApplicationPages.CalendarMouseHandler==="function"){
        SP.UI.ApplicationPages.CalendarMouseHandler.prototype.old$92_1 = SP.UI.ApplicationPages.CalendarMouseHandler.prototype.$92_1;
        SP.UI.ApplicationPages.CalendarMouseHandler.prototype.$92_1 = function($p0) {
            var callParent = true;
            var node = $p0.target;
            if(node.tagName === "A"){
                var evtid = node.getAttribute("evtid");
                if(evtid && evtid === "new_item"){
                    //callParent = false;
                    alert("add new link clicked");
                }
            }
            if(callParent){
                this.old$92_1($p0);
            }
        };
    }
}
_spBodyOnLoadFunctionNames.push("updateCal");
</script>