Fix multi click Golden Cookie issue (issue 5)

CookieMonster.js

@@ -894,7 +894,7 @@ CM.Disp.CreateGCTimer = function() {
 	CM.Disp.GCTimer.style.fontFamily = '\"Kavoon\", Georgia, serif';
 	CM.Disp.GCTimer.style.fontSize = '35px';
 	CM.Disp.GCTimer.style.cursor = 'pointer';
-	CM.Disp.GCTimer.onclick = Game.goldenCookie.click;
+	CM.Disp.GCTimer.onclick = function () { Game.goldenCookie.click(); CM.Disp.GCTimer.style.display = 'none'; };
 		
 	l('game').appendChild(CM.Disp.GCTimer);
 }