Answers for "check page loaded in jquery"

check if jquery is loaded

$(document).ready(function(){
  if (jQuery) {  
    // jQuery is loaded  
    alert("Yeah!");
  } else {
    // jQuery is not loaded
    alert("Doesn't Work");
  }
});

on page fully loaded jquery

$(window).load(function () {
    ....
});

If you have to wait for an iframe (and do not care about the assets, just the 
DOM) - try this:

$(document).ready(function() { 
    $('iframe').load(function() { 
       // do something
    });
});