str = window.navigator.platform;
re = "Win";
re2 = "Mac";
if (str.match(re)) {
    document.write('<link rel="stylesheet" href="../ls_win.css">');
}
else
if (str.match(re2)) {
    document.write('<link rel="stylesheet" href="../ls_mac.css">');
}
else {
    document.write('<link rel="stylesheet" href="../ls_win.css">');
}