Should I use png-8 or png-24 in my website? Do most websites still use png-8 or is browser support good enough that I can safely use png-24? I have some jquery sliders, I don't know if that makes any difference or not.
Browser support is good enough that you can use PNG-24. IE6 even supports PNG-24.
If you're using the images for sliders, though, you'll probably want transparency and PNG-32 is supported by every modern browser as well. IE6 can display them, albeit without the proper transparency (unless you use hacks.)