How to get all children of an html element working in IE and Firefox

var children = document.getElementById('myId').childNodes;
// or
var children = document.getElementById('myId').getElementsByTagName('*');

the first returns the list of direct descendants, but the second one returns a list of all descendants.

There are some differences between IE and Firefox when interpreting javascript like:
document.all does not work in firefox.(we should always use document.getElementById('blah'); )
To get control innerText, for IE there is innerText property and for firefox, there is textContent,
so it is better to user innerHtml that works for both.