another easy way to do it: Just create a hyperlink with the following href
UPS:
http://wwwapps.ups.com/WebTracking/track?loc=en_US&track.x=Track&trackNums=put_tracking_number_here
FEDEX:
http://fedex.com/Tracking?action=track&language=english&cntry_code=us&tracknumbers=put_tracking_number_here
(not as elegant, but quick, easy and gets the job done!)
