How to observe when an element is created

readyelement.js

var readyElement = (function(){
  return {
    observe : function(id,callback){
      var interval = setInterval(function(){
        if(document.getElementById(id)){
          callback(document.getElementById(id));
          clearInterval(interval);
        }
      },60); 
    }
  }
})();

readyElement.observe('my_awesome_new_element',function(el){ console.log(el) });

Cool, sounds like a good micro-solution.