I have javascript variable obj which represents an element in the DOM and I wish to change its ID. I have attempted to do this by the following, which also illustrates that it does not work!

obj.id = newID;



alert(obj.id); // this gives me newID as required



var element = document.getElementById(newID);



if (element != null) { alert(Hooray); // this alert never gets displayed! }

What is wrong with my code above that means that the id seems to be changed but not picked up in the DOM? Many thanks in advance.