jQuery(function($){
  // jQuery.browser is depricated, so we need to recreate it:
  var userAgent = navigator.userAgent.toLowerCase();
  var version = (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [0,'0'])[1];
  version = version.substr(0, 1);
  
  if(/webkit/.test( userAgent )){
    var browser = 'webkit';
  } else if (/opera/.test( userAgent )) {
    var browser = 'opera';
  } else if (/msie/.test( userAgent ) && !/opera/.test( userAgent )) {
    var browser = 'ie';
  } else if (/mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )) {
    var browser = 'gecko';
  };

  var classes = (browser + ' ' + browser + version); 
  $('body').addClass(classes);
});