Get html of the elements in another page is not working!

Get html of the elements in another page is not working!

Hello,

I'm trying get the html of an element in another page, but i am having problems.

I am using $.get function, look at the code:
  1. $.get('page',function(d){$('#derp').html($('body',d).html())});
Are returning null, please i need help.

Note: Sorry for my english.