CSS force image resize and keep aspect ratio

I am working with images, and I ran into a problem with aspect ratios. <img src=”big_image.jpg” width=”900″ height=”600″ alt=”” /> As you can see, height and width are already specified. I added a CSS rule for images: img { max-width: 500px; } But for big_image.jpg, I receive width=500 and height=600. How do I set images … Read more