I want to find the heights of my columns after images load.

I want to find the heights of my columns after images load.

I have a page with three columns. I have the following code:
  1. $(document).ready(function(){
      var left = $('#left_sidebar').height();
      var right = $('#right_sidebar').height();
      var center = $('#content').height();
    });
The 3 variables give me the heights of the columns before all images are loaded.  Is there a way to find the heights AFTER the images load?

thanks,
mike