// Choisir la feuille de styles suppl. pour Communicator 4 ou les autres (ie)
// Select the supplementary style sheet according to Netscape Communicator 4 or others (ie)
if ((navigator.appName == 'Netscape') && (navigator.appVersion.substring(0,1)==4)) 
    document.write('<LINK REL=StyleSheet HREF="zstyles_avent_comm.css" TYPE="text/css">')
else
    document.write('<LINK REL=StyleSheet HREF="zstyles_avent_ie.css" TYPE="text/css">');
if ((navigator.appName == 'Netscape') && (navigator.appVersion.substring(0,1)>4)) 
    document.write('<LINK REL=StyleSheet HREF="zstyles_avent_ie_n6.css" TYPE="text/css">')