DOM Manipulation problem

DOM Manipulation problem

Hi to everybody!
I'll try to explain my problem:
I need to do multi DOM manipulation into a page without reload it (something like: when i click on a thum in another part load a photo with a specific text, if i click on this text load another photo).

I use a js like

$(document).ready(function() {
  $(".MYCLASS1").click(function(){
     // MY_CODE 1
     return false;
  });

  $(".MYCLASS2").click(function(){
   // MY_CODE 2
   return false;
  });
});


first page loading everything goes good.... but when i fall into MY_CODE1, i can't execute MY_CODE2 anymore.....

any suggestions?

thanks in advance