The problem is actually in jesters.js, on line 41:
Code:
36: startSubmenu("jesters_b6", "jesters_menu", 139);
...
41: endSubmenu("jesters_b5");
Note how your code begins creating "jesters_b6" but it tries to end "jesters_b5". Jesters_b5 doesn't exist yet, so it can't end it. You need to change line 41 to the following:
Code:
endSubmenu("jesters_b6");
Note that the code for jesters_b5 starts on line 42.