Mouse Over to Enlarge Graphics

Mouse Over to Enlarge Graphics On the web page <[login to view URL]> It currently says "click to enlarge" but what it really does is download the pdf of the image on to your desktop when you click it. I would like you to do two things with each image: 1)Make the image that appears on the site more crisp and clean (may need to resize it to properly fit the spot it is occupying) 2)Make it so that when the user "mouses over" the image on the screen, an enlarged image pops up. there are approximately 50 images on the page.