Gone are the days when you could "steal " an image from another website or from Google images. The expectation is that you use your own images or images that are Creative Common or specified to be used for educational purposes.Below are several excellent resources for images if you need images for your presentations.
http://www.servier.com/SMART/home_smart.asp
http://www.lib.uiowa.edu/hardin/md/pictures.html
http://www.library.uthscsa.edu/internet/ImageDatabases.cfm
http://www.healthcarefreeware.com/photo.htm
http://www.healcentral.org/index.jsp
