I think there is some problem in your code, because code similar to your 
description exists e.g. in Scriptaculous:

Effect.Base = Class.create({
  position: null,
  start: function(options) {
    ...
  },
  ...
});

Effect.Parallel = Class.create(Effect.Base, {
  initialize: function(effects) {
    this.effects = effects || [];
    this.start(arguments[1]);
  },
  ...
});

and we definitely know it works in IE7.

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