Using getElementById ?

Hi,

For my plugin I need to retrieve the content (with the html tags) of
a div wich has an id named "media".

in a classical javascript code it looks like that:

var content = document.getElementById('media').innerHTML;
alert(content);

So I tried:

var content = editor.document.getElementById('media').innerHTML;

but it doesn't work.

How can I use it with the CKeditor API ?

Thanks