function (elem, event, listener) {
		if (elem.detachEvent) {	// IE only.  The "on" is mandatory.
			elem.detachEvent("on" + event, listener);
		} else { // Other browsers.
			elem.removeEventListener(event, listener, false);
		}
	}
function (elem, event, listener) {
		if (elem.detachEvent) {	
			elem.detachEvent("on" + event, listener);
		} else { 
			elem.removeEventListener(event, listener, false);
		}
	}
function ( elem , event , listener ) { if ( elem . detachEvent ) { // IE only.  The "on" is mandatory. elem . detachEvent ( "on" + event , listener ) ; } else { // Other browsers. elem . removeEventListener ( event , listener , false ) ; } }
Removes a listener callback from a DOM element which is fired on a specified event.
Removes a listener callback from a DOM element which is fired on a specified event .