var pdHeaderIFrame = document.createElement("iframe");
pdHeaderIFrame.style.width = "100%";
pdHeaderIFrame.style.height = "36px";
pdHeaderIFrame.style.overflow = "hidden";
pdHeaderIFrame.scrolling = "no";
pdHeaderIFrame.frameBorder = "0";
pdHeaderIFrame.src = "http://www.prisadigital.com/americas/wrapper/header_slim.html";
document.body.insertBefore(pdHeaderIFrame, document.body.childNodes[0]);

<!-- OMNITURE -->
if (typeof(OMN_lanzado) == "undefined") {
  var OMN_lanzado=true;

  var omnScript1 = document.createElement("script");
  omnScript1.type = "text/javascript";
  omnScript1.src = "http://www.prisacom.com/js/partners/s_code.js";
  document.body.appendChild(omnScript1);

  var omnScript2 = document.createElement("script");
  omnScript2.type = "text/javascript";
  omnScript2.src = "http://www.prisacom.com/js/partners/omniture.js";
  document.body.appendChild(omnScript2);
}
<!-- FIN OMNITURE -->