text: 'use strict';
  
  function LightenDarkenColor(col, amt) {
  
      var usePound = false;
  
      if (col[0] === '#') {
          col = col.slice(1);
          usePound = true;
      }
  
      var num = parseInt(col,16);
  
      var r = (num >> 16) + amt;
  
      if (r > 255) r = 255;
      else if  (r < 0) r = 0;
  
      var b = ((num >> 8) & 0x00FF) + amt;
  
      if (b > 255) {
        b = 255;
      }
      else if  (b < 0) {
        b = 0;
      }
  
      var g = (num & 0x0000FF) + amt;
  
      if (g > 255) {
        g = 255;
      }
      else if (g < 0) {
        g = 0;
      }
  
      return (usePound?'#':'') + (g | (b << 8) | (r << 16)).toString(16);
  
  }
  