Prototype.js - destination is undefined

[Debbie-Leigh]

Hi,

I'm trying to use a javascript tabstrip script called aptabs, which uses prototype.js. However, prototype.js won't load properly, because the following error occurs in prototype.js:

destination is undefined

on the following line (3042):

destination[property] = value.methodize();

The function this line is in is:

  function copy(methods, destination, onlyIfAbsent) {
    onlyIfAbsent = onlyIfAbsent || false;
    for (var property in methods) {
      var value = methods[property];
      if (!Object.isFunction(value)) continue;
      if (!onlyIfAbsent || !(property in destination))
        destination[property] = value.methodize();
    }
  }

I've tried using versions 1.6.0 all the way up to 1.6.1, but I still get the same error.

Can someone suggest what this error could be caused by and possible fixes?

Debbie