var sources;
d3.json( "/json/podcast/podcast.json",function(d){
  d3.select("#audioframe").attr("src",d[0].source);
  sources=d;
});
d3.selectAll("p.ctitle").on('click', function(){
  var this_id=d3.select(this).attr("value");
  sources.forEach(function (d){
    if(d.id == this_id){ 
      d3.select("#audioframe").attr("src",d.source);
      window.scroll(0,
      d3.select("#sframe").node().getBoundingClientRect().top -
      d3.select("#stitle").node().getBoundingClientRect().top
      );
    }
  });
  });