[HTML] pobierz, plaintext 
<form method="post">
	<input type="text" id="text"/>
	<input type="button" id="btn" value="add"/>
	<input type="button" id="btn2" value="remove"/>
</form>
[HTML] pobierz, plaintext 

function addElement () {
  // create a new div element
  // and give it some content

  var newDiv = document.createElement("iframe");
  newDiv.setAttribute('width',560);
  newDiv.setAttribute('height',315);
  newDiv.setAttribute('src',document.getElementById('text').value);
  newDiv.setAttribute('frameborder',0);
  newDiv.setAttribute('allowfullscreen','allowfullscreen');
  newDiv.setAttribute('id','divek');
  var newContent = document.createTextNode("Hi there and greetings!");
  newDiv.appendChild(newContent); //add the text node to the newly created div.

  // add the newly created element and its content into the DOM
  var currentDiv = document.getElementById("div1");
  document.body.insertBefore(newDiv, currentDiv);
}
function removeElement(){
    document.getElementById('divek').remove();
}
document.getElementById('btn').addEventListener('click',addElement,false);
document.getElementById('btn2').addEventListener('click',removeElement,false);