if (client.environment=="Macintosh") document.write('<link rel="stylesheet" type="text/css" href="mac.css">');

     else if (client.environment=="Windows")

     {

        if (client.name=="IE")document.write('<link rel="stylesheet" type="text/css" href="win_ie.css">');

        else if ((client.name=="Netscape")&&(client.version<5))document.write('<link rel="stylesheet" type="text/css" href="win_ns.css">');

        else if ((client.name=="Netscape")&&(client.version>=5))document.write('<link rel="stylesheet" type="text/css" href="win_ns6.css">');

		else document.write('<link rel="stylesheet" type="text/css" href="win_ie.css">');

     }

     else document.write('<link rel="stylesheet" type="text/css" href="win_ie.css">');