title: Tumblr photoset percentage width
body: <p>I'm creating a 4 colum Tumblr theme. Each column width is 25% and using {PhotoURL-500} images shrink or expand OK regardless of the window size, the problem comes with photosets, they are static and make the columns collapse. Since I'm not working with pixels but with percentage there's a way of making photosets fit in % columns?
  Thanks!</p>