var browserName=navigator.appName; 
      if (browserName=="Netscape")
      { 

       document.write("<link href='style/plasmastyle_mz.css' rel='stylesheet' type='text/css'/>");
      }
      else 
      { 
       if (browserName=="Microsoft Internet Explorer")
       {

        document.write("<link href='style/plasmastyle_ie.css' rel='stylesheet' type='text/css'/>");
       }
       else
        {
          alert("What ARE you browsing with here?");
         }
      }