if(navigator.userAgent.indexOf("Firefox")!=-1)
 {
  document.write ("<link href='styles/mapsff.css' rel='stylesheet' type='text/css' media='all'/>");
 }
if (navigator.appVersion.indexOf("MSIE")!=-1)
 {
  document.write ("<link href='styles/mapsie.css' rel='stylesheet' type='text/css' media='all'/>");
 }