function getParameterByName(name, url) {
  if (!url) {
    url = window.location.href;
  }
  name = name.replace(/[\[\]]/g, "\\$&");
  var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
      results = regex.exec(url);
  if (!results) return null;
  if (!results[2]) return '';
  return decodeURIComponent(results[2].replace(/\+/g, " "));
}

/*!
 * Dynamically changing favicons with JavaScript
 * Works in all A-grade browsers except Safari and Internet Explorer
 * Demo: http://mathiasbynens.be/demo/dynamic-favicons
 */

// HTML5™, baby! http://mathiasbynens.be/notes/document-head
document.head || (document.head = document.getElementsByTagName('head')[0]);

function changeFavicon(src) {
 var link = document.createElement('link'),
     oldLink = document.getElementById('dynamic-favicon');
 link.id = 'dynamic-favicon';
 link.rel = 'shortcut icon';
 link.href = src;
 if (oldLink) {
  document.head.removeChild(oldLink);
 }
 document.head.appendChild(link);
}

// Return base64 image dataURL
function createFavIcon(color) {
  // Create a canvas element
  var canvas = document.createElement('canvas');
  canvas.width = 133;
  canvas.height = 133;

  // Get the drawing context
  var ctx = canvas.getContext('2d');

  // Then you can do stuff, e.g.:
  ctx.fillStyle = color;
  ctx.fillRect(0,0,133,133);

  return canvas.toDataURL()
} 

// Comapre HEX Colors
function hexColorDelta(hex1, hex2) {
  // get red/green/blue int values of hex1
  var r1 = parseInt(hex1.substring(0, 2), 16);
  var g1 = parseInt(hex1.substring(2, 4), 16);
  var b1 = parseInt(hex1.substring(4, 6), 16);
  // get red/green/blue int values of hex2
  var r2 = parseInt(hex2.substring(0, 2), 16);
  var g2 = parseInt(hex2.substring(2, 4), 16);
  var b2 = parseInt(hex2.substring(4, 6), 16);
  // calculate differences between reds, greens and blues
  var r = 255 - Math.abs(r1 - r2);
  var g = 255 - Math.abs(g1 - g2);
  var b = 255 - Math.abs(b1 - b2);
  // limit differences between 0 and 1
  r /= 255;
  g /= 255;
  b /= 255;
  // 0 means opposit colors, 1 means same colors
  return (r + g + b) / 3;
}

// Get similar name color
function getSimilarColorName(color) {
  var difference = 0;
  var finalColor
  for (i in Object.keys(tinycolor.hexNames)) {
    var currentDiff = hexColorDelta(color, Object.keys(tinycolor.hexNames)[i]);
    if (currentDiff > difference) {
      difference = currentDiff;
      finalColor = Object.keys(tinycolor.hexNames)[i]
    }
  }

  return tinycolor.hexNames[finalColor];
}