function closeflash() {
  var rd = document.getElementById("richmedia_div");
  rd.style.display = "none";
}

var rd = document.getElementById("richmedia_div");
rd.style.top = (Math.round((document.body.clientHeight-380)/2)+document.body.scrollTop) + "px";
rd.style.left = Math.round((document.body.clientWidth-620)/2) + "px";