// user's functions

  var sAgent = navigator.userAgent.toLowerCase() ;
  // Internet Explorer
  ( sAgent.indexOf("msie") != -1 && sAgent.indexOf("mac") == -1 ) ?
  ( document.write('<link href="_mod_files/_css//style_ie.css" type="text/css" rel="stylesheet">') ) :
  ( document.write('<link href="_mod_files/_css//style_moz.css" type="text/css" rel="stylesheet">') ) ;