Add, Remove and Get URL Parameters in Javascript

url-parameters.js

// Insert URL parameter
function insertUrlParameter(key, value)
{
  key = encodeURI(key); value = encodeURI(value);
  var kvp = document.location.search.substr(1).split('&');
  var i=kvp.length; var x; while(i--) 
  {
    x = kvp[i].split('=');
    if (x[0]==key)
    {
      x[1] = value;
      kvp[i] = x.join('=');
      break;
    }
  }
  if(i<0) {kvp[kvp.length] = [key,value].join('=');}

  document.location.search = kvp.join('&');
}

// Get URL Parameter
function getUrlParameter(Param) 
{
  var PageURL = window.location.search.substring(1),
      URLVariables = PageURL.split('&'),
      ParameterName,
      i;

  for (i = 0; i < URLVariables.length; i++) {
    ParameterName = URLVariables[i].split('=');

    if (ParameterName[0] === Param) {
      return ParameterName[1] === undefined ? true : decodeURIComponent(ParameterName[1]);
    }
  }
}

// Remove URL parameter
function removeUrlParameter(Param)
{
  var url = window.location.href.split('?')[0]+'?';
  var PageURL = decodeURIComponent(window.location.search.substring(1)),
      URLVariables = PageURL.split('&'),
      ParameterName,
      i;

  for (i = 0; i < URLVariables.length; i++) {
    ParameterName = URLVariables[i].split('=');
    if (ParameterName[0] != Param) {
      url = url + ParameterName[0] + '=' + ParameterName[1] + '&'
    }
  }
  window.location = url.substring(0,url.length-1);
}