if(navigator.appName=="Microsoft Internet Explorer" && navigator.platform=="Win32"){
document.write('');
}
else if(navigator.appName=="Netscape" && navigator.platform=="Win32"){
document.write('');
}
else if(navigator.appName=="Microsoft Internet Explorer" && navigator.platform=="MacPPC"){
document.write('');
}
else if(navigator.appName=="Netscape" && navigator.platform=="MacPPC"){
document.write('');
}