Unloading XML

I was hoping someone could tell me how to unload xml correctly. I need to unload an xml file on release of a button, then load new XML. Currently I am unLoading the initial xml by unLoading the target clip. However, when I do this not all of the assets (jpgs) that where loaded with the xml delete form the screen. The following is the code I am currently using. Any help would be great. Thanks.

interactivePortfolio_btn.onRelease = function() {
portfolioLabel_txt.text = “Interactive Portfolio”;
_parent.description_txt.text = “”;
_parent.info_txt.text = “”;