[mochikit] problems with the interpreter

[reflog]

hi there.
i've been trying to use the interpreter demo at the MochiKit site, but
for every command i type, i get:

>>> _
Error:
        fileName        
http://www.mochikit.com/examples/interpreter/interpreter.js
lineNumber      156
message eval.call is not a function
name    TypeError
stack   ("_")@http://www.mochikit.com/examples/interpreter/interpreter.js:156
apply([object Object],[object Object])@:0
("_")@http://www.mochikit.com/MochiKit/Base.js:591
()@http://www.mochikit.com/examples/interpreter/interpreter.js:198
apply([object Object],[object Object])@:0
()@http://www.mochikit.com/MochiKit/Base.js:591 ([object
Event])@http://www.mochikit.com/examples/interpreter/interpreter.js:51
apply([object Object],[object Object])@:0 ([object
Event])@http://www.mochikit.com/MochiKit/Base.js:591 @:0

For the reference, I am using Firefox 1.0.7 on Ubuntu Linux.