Actually i am doing a blog with most of images on it.

Some images have bigger than 500kb its too dificult for normal users to wait on site. So please suggest me to load site fast.Actually i want to reduce file size (suppose 500kb to 80kb(1024*768)) like this i want.

Please anyone tellme (1024*768 - 800*600.........) best file sizes for image optimization and any tricks to improve site.