graphics with transparent background placed on a stretched graphic

[yellowbird]

Question on graphics with transparent background and web stretchy. The attached jpg is a screenshot of an xara webpage. The graphic on the left is a saved .png with transparent background. The second photo used the magnetic lasso tool to cut the photo without the background. The third photo I used the enhance photo tool, mask tool, and Select colors to enhance tool to remove the background. You can see what happens to each when a stretchy background graphic is put behind. The 1st and third seem to grab the original unstretched bacground when displaying. What's the difference? .xar attached. Thanks.

Nancy