var agt=navigator.userAgent.toLowerCase();
var nav;
if (agt.indexOf("mac")!=-1) {
if ( navigator.userAgent.indexOf("MSIE") != -1 ) {
document.write (' ') ;
version = parseInt(navigator.appVersion);
if (( version == 4 ) && (agt.indexOf("msie 5.0")==-1)) {
nav = 'ie_mac_4.5';
}
} else {
document.write (' ') ;
nav = 'net';
}
} else {
if ( navigator.userAgent.indexOf("MSIE") != -1 ) {
document.write (' ') ;
nav = 'ie';
} else {
document.write (' ') ;
nav = 'net';
}
}