var OSname, BRname, BRver, CSSpath, CSSfile;

CSSpath = "/common/css/";

if ( navigator.appVersion.search("Windows") >= 0 ) { OSname = "Win" }
else if ( navigator.appVersion.search("Mac") >= 0 ) { OSname = "Mac" }
else { OSname = "Others" }

if ( navigator.appName.search("Internet Explorer") >= 0 ) { BRname = "IE" }
else if ( navigator.appName.search("Netscape") >= 0 ) { BRname = "NN" }
else { BRname = "Others" }

BRver = Number( navigator.appVersion.charAt(0) );

if      ( OSname == "Win" && BRname == "IE" && BRver>=4 )   { CSSfile = "win_ie_4ov.css"; }	// WindowsのIE4.x以上
else if ( OSname == "Mac" && BRname == "IE" && BRver >= 4 ) { CSSfile = "mac_ie_4ov.css"; }	// MacのIE4.x以上
else if ( OSname == "Win" && BRname == "NN" && BRver == 4 ) { CSSfile = "win_nn_4x.css";  }	// WinのNN4.x
else if ( OSname == "Mac" && BRname == "NN" && BRver == 4 ) { CSSfile = "mac_nn_4x.css";  }	// MacのNN4.x
else if ( OSname == "Win" && BRname == "NN" && BRver >= 5 ) { CSSfile = "win_nn_5ov.css"; }	// WinのNN5.x以上
else if ( OSname == "Mac" && BRname == "NN" && BRver >= 5 ) { CSSfile = "mac_nn_5ov.css"; }	// MacのNN5.x以上
else { CSSfile = "others.css"; }	// その他のブラウザ

document.write("<link rel='stylesheet' type='text/css' href='" + CSSpath + CSSfile + "'>");

// alert(OSname + " / " + BRname + " / " + BRver);