mac=(navigator.appVersion.indexOf('Mac')!=-1)?true:false;
ie=(navigator.appName.charAt(0)=="M")?true:false;

document.write("<STYLE TYPE='text/css'><!--")

if(mac){
document.write('.xsmallsize {font-size:9px; line-height:12px}');
document.write('.smallsize {font-size:10px; line-height:14px}');
document.write('.middlesize {font-size:12px; line-height:16px}');
document.write('.largesize {font-size:14px; line-height:16px}');
}
else{
document.write('.xsmallsize {font-size:12px; line-height:14px}');
document.write('.smallsize {font-size:12px; line-height:14px}');
document.write('.middlesize {font-size:12px; line-height:15px}');
document.write('.largesize {font-size:14px; line-height:16px}');
}

document.write('//--></STYLE>');