Javascript "Member not found" error in IE8

Question

I'm trying to debug the following block of Javascript code to see what the issue is. I'm getting an error that says "Member not found" on the line

constructor = function() {

in the extend:function() method.

I'm not very good with Javascript, and I didn't write this, so I'm kind of lost on what the issue is. The error only occurs in IE8, it works fine in IE7 and Firefox.

var Class = {
  create: function() {
    return function() {
        if(this.destroy) Class.registerForDestruction(this);
          if(this.initialize) this.initialize.apply(this, arguments);
      }
  },

  extend: function(baseClassName) {
    constructor = function() {
        var i;

          this[baseClassName] = {}
        for(i in window[baseClassName].prototype) {
            if(!this[i]) this[i] = window[baseClassName].prototype[i];
            if(typeof window[baseClassName].prototype[i] == 'function') {
                this[baseClassName][i] = window[baseClassName].prototype[i].bind(this);
            }
        }

        if(window[baseClassName].getInheritedStuff) {
            window[baseClassName].getInheritedStuff.apply(this);
        }

        if(this.destroy) Class.registerForDestruction(this);
          if(this.initialize) this.initialize.apply(this, arguments);
    }

    constructor.getInheritedStuff = function() {
        this[baseClassName] = {}
        for(i in window[baseClassName].prototype) {
            if(!this[i]) this[i] = window[baseClassName].prototype[i];
            if(typeof window[baseClassName].prototype[i] == 'function') {
                this[baseClassName][i] = window[baseClassName].prototype[i].bind(this);
            }
        }

        if(window[baseClassName].getInheritedStuff) {
            window[baseClassName].getInheritedStuff.apply(this);
        }
    }

    return constructor;

  },

  objectsToDestroy : [],  
  registerForDestruction: function(obj) {
    if(!Class.addedDestructionLoader) {
            Event.observe(window, 'unload', Class.destroyAllObjects);
        Class.addedDestructionLoader = true;
    }
    Class.objectsToDestroy.push(obj);
  },

  destroyAllObjects: function() {
    var i,item;
    for(i=0;item=Class.objectsToDestroy[i];i++) {
        if(item.destroy) item.destroy();
    }
    Class.objectsToDestroy = null;
  }  
}

Answer 1

This may not be the issue, but you probably want to make construct variable local by using var statement.

var constructor = function() { ...

Answer 2

One immediate problem I see is that "constructor" is a global variable. Use "var constructor = function..." to give it local scope.