var agent = navigator.userAgent.toLowerCase(); 
var ver = parseInt(navigator.appVersion); 
if ((agent.indexOf("mozilla") != -1) && (ver >= 4) && (navigator.appName.indexOf("Netscape") != -1)) 
document.write('<LINK HREF="texte_agri_netscape.css" REL="stylesheet" TYPE="text/css">'); 
else 
document.write('<LINK HREF="texte_agri.css" REL="stylesheet" TYPE="text/css">');