function getMetarsTafs(site) {
   var dispURL, TAFoccur;
   var prefix = "/tafs/displayMetarsTafs.php";
   if (document.navGraphic) {
     document.navGraphic.site.value = site;
     document.navGraphic.submit();
   } else {
     dispURL =  prefix + "?site=" + site;
     window.open(dispURL, "_self");
   }
}