accessing a 'media:thumbnail' tag in rss feed using basic javascript xml

Question

How would I access a mediarss tag like <media:thumbnail> using basic javascript like getElementsByTagName? P.S I do not want to use a library or server side scripting, also a json object is not available from the rss feed i am using, and i do not want to create one in php...

Answer 1

It seems this issue is covered here, where they talk about using getElementsByTagNameNS.