Searching xml data island with javascript

If i have this data island in an html page:
<xml id=“wine_notes” src=“wine_notes.xml”></xml>

how can i search it with javascript? say the contents of the xml document is:
<house>Chateau de La Chaize</house>
<region>Brouilly, France</region>
<house>Chateau d’Epire</house>
<region>Savennieres, France</region>
<type>Cuvee Speciale</type>

I want to compare the value of each house tag with a string entered into an input box. If a result is found, want it to display in a div. Can anyone tell me how to do this?

Brendan Smtih