//======================
// Win Internet Explorer 5.0
// Win Internet Explorer 6.0
// Win Netscape 6.2
// Mac Internet Explorer 5.0
// Mac Netscape Communicator 4.7
// Mac Netscape 6.1
//======================

oss = navigator.platform.substring(0,3);
app = navigator.appName.charAt(0);
ver = navigator.appVersion.charAt(0);

if ( oss == "Mac" ) {
    if ( app == "M" ) {
        if ( ver == 4 ) { css = "mac_i5"; }
        else { css = "mac_i5"; }
    }
    if ( app == "N" ) {
        if ( ver == 4 ) { css = "mac_n5"; }
        else if ( ver == 5 ) { css = "mac_n6"; }
        else { css = "mac_n4"; }
    }
}

if ( oss == "Win" ) {
    if ( app == "M" ) {
        if ( ver == 4 ) { css = "win_i5"; }
        else { css = "win_i5"; }
    }
    if ( app == "N" ) {
        if ( ver == 5 ) { css = "win_n6"; }
        else if ( ver == 4 ) { css = "win_n4"; }
    }
}