var node = document.getElementById("conrego_iframe_holder");
node.innerHTML = '<iframe id="conrego_iframe_content" src="https://investcuffs.conrego.com/register/iframe?language=pl" style="border: 0pt none ;'+ 'width: 100%;overflow: hidden"'+ 'scrolling="no" ></iframe>';


window.addEventListener('message', function(event) {
if(event.origin == 'https://investcuffs.conrego.com'){
document.getElementById("conrego_iframe_content").style.height = event.data+"px";
}
});