code: function ready( fn ) {
  	        if ( !isReady ) {
  	    
  	            // Make sure body exists, at least, in case IE gets a little overzealous (ticket #5443).
  	            if ( !doc.body ) {
  	                return defer( ready );
  	            }
  	    
  	            // Remember that the DOM is ready
  	            isReady = true;
  	    
  	            // Execute all callbacks
  	            while ( fn = callbacks.shift() ) {
  	                defer( fn );
  	            }
  	        }
  	    }
docs: Handle when the DOM is ready