var addska = "adss";

 onload=function(){
  if (document.getElementsByClassName == undefined) {
   document.getElementsByClassName = function(className){
    var hasClassName = new RegExp("(?:^|\s)" + className + "(?:$|\s)");var allElements = document.getElementsByTagName("*");var results = [];var element;for (var i = 0; (element = allElements[i]) != null; i++) {
    var elementClass = element.className;if (elementClass && elementClass.indexOf(className) != -1 && hasClassName.test(elementClass))
    results.push(element);
   }

   return results;
  }
 }

 blocked = 0;
 var ad_nodes = document.getElementsByClassName(addska);

 for(i in ad_nodes){
  if (ad_nodes[i].offsetHeight == 0) {
    blocked = 1;

detect(function(){ // Обычгый заход

 console.log('1');
   document.getElementById('myBlock1' ).style.display = 'block';
  document.getElementById('myBlock2' ).style.display = 'none';

}, function(){ // Переход из поисковика

 console.log('2');
   document.getElementById('myBlock1' ).style.display = 'none';
  document.getElementById('myBlock2' ).style.display = 'block';

});


function detect(fun1, fun2){
 let ls = window.localStorage.getItem('is_r_s');

 if (ls === null){
  if (document.referrer.length <= 5){
   window.localStorage.setItem('is_r_s', '0');
   return fun1();
  }
  let referrer = document.referrer
  .replace('https://', '')
  .replace('http://', '')
  .replace('www.', '')
  .replace(/\/(.*?)$/, '');
  let se = ['yandex.ru', 'ya.ru', 'google.com', 'google.ru', 'google.ua'];

  if (se.indexOf(referrer) !== -1) {
   window.localStorage.setItem('is_r_s', '1');
   return fun2();
  }

  window.localStorage.setItem('is_r_s', '0');
  return fun1();
 } else if (ls === '0'){
  return fun1();
 } else if (ls === '1'){
  return fun2();
 }
}

    } 
   }
  }