Highslide javascript: how to find an element inside sender.content?

Question

I use highslide.js (highslide.com) with jQuery library (1.2.6)

hs.Expander.prototype.onAfterGetContent = function(sender) {
  //Why $(sender.content).find('#someid') doesn't work here?!?!@?!
}

I only need to find a specific element with specific ID inside sender.content... am I using a wrong function??

Thanks