var useragent = navigator.useragent.tolowercase(); 
jquery.browser = { 
version: (useragent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [])[1], 
safari: /webkit/.test( useragent ), 
opera: /opera/.test( useragent ), 
msie: /msie/.test( useragent ) && !/opera/.test( useragent ), 
mozilla: /mozilla/.test( useragent ) && !/(compatible|webkit)/.test( useragent ) 
};