added override parameter to toggleHelp function

js/reveal.js

@@ -1630,8 +1630,17 @@
 
 	/**
 	 * Open or close help overlay window.
+	 *
+	 * @param {Boolean} [override] Flag which overrides the
+	 * toggle logic and forcibly sets the desired state. True means
+	 * help is open, false means it's closed.
 	 */
-	function toggleHelp(){
+	function toggleHelp( override ){
+		
+		if( typeof override === 'boolean' ) {
+			override ? showHelp( true ) : closeOverlay();
+		}
+		else {		
 			if( dom.overlay ) {
 				closeOverlay();
 			}
@@ -1639,6 +1648,8 @@
 				showHelp( true );
 			}
 		}
+	}
+
 	
 	/**
 	 * Opens an overlay window with help material.