Modernizr snippet to replace all the image sources with PNG if there is no support for SVG

modernizr-svg-replace.js

if (!Modernizr.svg) {
  // wrap this in a closure to not expose any conflicts
  (function() {
    // grab all images. getElementsByTagName works with IE5.5 and up
    var imgs = document.getElementsByTagName('img'),endsWithDotSvg = /.*\.svg$/,i = 0,l = imgs.length;
    // quick for loop
    for(; i < l; ++i) {
      if(imgs[i].src.match(endsWithDotSvg)) {
        // replace the png suffix with the svg one
        imgs[i].src = imgs[i].src.slice(0, -3) + 'png';
      }
    }
  })();
}