Javascript function to get a url parameter

  /**
   * Returns url param value
   * @author Arash Yalpani
   *
   * @param url The url to be queried
   * @param paramName The params name
   * @return paramName's value or false if param does not exist or is empty
   *
   * @example getUrlParam('http://localhost/?a=123', 'a') => 123
   * @example getUrlParam('http://localhost/?a=123', 'b') => false
   * @example getUrlParam('http://localhost/?a=',    'a') => false
   */
 
  getUrlParam: function(url, paramName) {
    var urlSplit = url.split('?');
    if (!urlSplit[1]) { // no query
      return false;
    }
 
    var urlQuery = urlSplit[1];
    var paramsSplit = urlSplit[1].split('&');
    for (var i = 0; i < paramsSplit.length; i++) {
      paramSplit = paramsSplit[i].split('=');
      if (paramSplit[0] == paramName) {
        return paramSplit[1] ? paramSplit[1] : false;
      }
    }
 
    return false;
  }