javascript document.getElementsByClassName compatibility with IE

Question

What is the best method to retrieve an array of elements that have a certain class?

I would use document.getElementsByClassName but IE does not support it.

Answer 1

function getElementsByClassName(className) {
if (document.getElementsByClassName) { 
  return document.getElementsByClassName(className); }
else { return document.querySelectorAll('.' + className); } }

Pretty sure this is the same as Leonid's function but this uses document.getElementsByClassName when it can.