How do I link from my facebook app out to an external site?

Question

I have a facebook app that I want to link out to an external site. Facebook seems to be messing with the HTML anchor tag. On one occasion, Fbook added a query param. So a link to http://www.google.com became

http://www.google.com/?_fb_q=1

which yields an invalid link. On another occasion it changed the entire url to

http://apps.facebook.com/home?url=http%3A%2F%2Fwww.google.com&_fb_fromhash=67346aa17edc998c7fa5c2ff3f0ecf50&_fb_q=1

which is also invalid. You can check out an example here: http://apps.facebook.com/fbislame/

I have seen other apps link out to external pages. How is this done?

UPDATE

Looks like a google issue. http://forum.developers.facebook.com/viewtopic.php?pid=161663#p161663