HTML5 localStorage replace data to already existing key

I have the following localStorage key:

localStorage.setItem(1, "<div id='MyId'>value 1</div><div id='NewId'>other value</div>");

Is it possible to replace, change only the second id, make the:

<div id='MyId'>value 1</div><div id='NewId'>other value</div>

turn into

<div id='MyId'>value 1</div><div id='NewId'>replaced value</div>

I do not want to delete this key and create a new one, just replace a part of it.
Thank you.

Taken from Dive into HTML5:

Calling setItem() with a named key
that already exists will silently
overwrite the previous value.

So read the value with getItem() [if needed], do your replace, set the new value with setItem().

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