function aConstructor() 
{
  this.onSubmitHandlers = new Object();
  this.registerOnSubmit = function (slotId, callback) 
  {
    if (!this.onSubmitHandlers[slotId])
    {
      this.onSubmitHandlers[slotId] = [ callback ];
      return;
    }
    this.onSubmitHandlers[slotId].push(callback);
  };
  this.callOnSubmit = function (slotId)
  {
    handlers = this.onSubmitHandlers[slotId];
    if (!handlers)
    {
      return;
    }
    for (i = 0; (i < handlers.length); i++)
    {
      handlers[i](slotId);
    }
  }
}

window.apostrophe = new aConstructor();