var so = new SWFObject("header.swf", "nav", "850", "297", "7");
so.addParam("wmode", "transparent");
so.write("header");

function OpenChildWin(nurl,nname, nwidth,nheight) {
  popupWin = window.open(nurl, nname, 'scrollbars=1,width=' + nwidth +',height=' + nheight)
}