var vNum = navigator.appVersion.charAt(0);
var bName = navigator.appName.charAt(0);
if(navigator.appVersion.indexOf("Mac") >= 0){ // MAC-----------------------------------
if( bName == "M") {
// MAC IE
document.write("");
} else if( vNum < 5 ){
// MAC NETSCAPE 4.x
document.write("");
} else if( vNum >= 5 ){
// MAC NETSCAPE 6.x
document.write("");
} else {
// Other
document.write("");
}
} else if (navigator.appVersion.indexOf("Win") >= 0){ //WIN----------------------------
if( bName == "M"){
// WIN IE
document.write("");
} else if( vNum < 5 ) {
// WIN NETSCAPE 4.x
document.write("");
} else if( vNum >= 5 ){
// WIN NETSCAPE 6.x
document.write("");
} else {
// Other
document.write("");
}
} else { //Other------------------------------------------------------------------------
document.write("");
}