Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
It might help to complete the 'alt' text in your code (well it will help your SEO if nothing else). If they still don't work, try stripping the class attributes from the lmage and see if it works then. If it still doesn't, try the code on a blank page and then steadily add your other code to see if there's a conflict or a missing tag somewhere affecting it. Sorry I can't be more help, I don't have Safari on this computer.
 
Not sure if you have changed anything yet, but those images seem to be clickable on Safari for Windows at least.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.