Inline: onclick="colorPicker(event)"

Injected: see script below...

<script>
  var inputTags = document.getElementsByTagName('input');

  for (var n=inputTags.length;n--;) {
    if (inputTags[n].className && inputTags[n].className.indexOf('color') > -1) {
      inputTags[n].onclick = function(e) {e = e || window.event; colorPicker(e)}
    }
  }
</script>