( function() {

 var youtube = document.querySelectorAll( ".youtube" );
	
 for (var i = 0; i < youtube.length; i++) {
		
 var source = "https://img.youtube.com/vi/"+ youtube[i].dataset.embed +"/sddefault.jpg";
		
 var image = new Image();
 image.src = source;
 image.addEventListener( "load", function() {
 youtube[ i ].appendChild( image );
 }( i ) );
		
 youtube[i].addEventListener( "click", function() {

 var iframe = document.createElement( "iframe" );

 iframe.setAttribute( "frameborder", "0" );
 iframe.setAttribute( "allowfullscreen", "" );
 iframe.setAttribute( "src", "https://www.youtube.com/embed/"+ this.dataset.embed +"?rel=0&showinfo=0&autoplay=1" );
 this.innerHTML = "";
 this.appendChild( iframe );
 } );	
 };
	
} )();