[jQuery] Copy text onkeyup locking up browser

[hubbs]

I am having a strange problem, where a function is freezing the
browser.

I have an iframe, which has an input field, and I want the text from
this, to update some inner html in its parent frame.

Have I don't something totally wrong here?

//Add update name function
$("#calendar_event_718").keyup(function () {
  content = $("#calendar_event_718").val();
  $("#inner", top.document).html() = content;
    });