function controller_links(dir) {

 var dir_about =
"http://www.columbia.edu/cu/controller/carusersguide/aboutcargetstarted_ap.html";

 var dir_guide =
"http://www.columbia.edu/cu/controller/carusersguide/index.htm";

   if (dir == "about"){
         location.href = dir_about;
   } else if (dir == "guide"){
         location.href =  dir_guide;
   }
 }

  function malts_links(dir) {

// var dir_win9x =
//"ftp://www-dvlp.ais.columbia.edu/pub/ais/malts/
 var dir_win9x = "downloads/carwin9x.exe";

// var dir_nt2k =
//"ftp://www-dvlp.ais.columbia.edu/pub/ais/malts/carnt2k.exe";
 var dir_nt2k = "downloads/carnt2k.exe";

// var dir_vista =
//"ftp://www-dvlp.ais.columbia.edu/pub/ais/malts/car2kxpvista.exe";
 var dir_vista = "downloads/car2kxpvista.exe";

// var dir_docpop =
//"ftp://www-dvlp.ais.columbia.edu/pub/ais/malts/DocPop.exe";
 var dir_docpop = "downloads/DocPop.exe";

   if (dir == "win9x"){
         location.href = dir_win9x;
   } else if (dir == "nt2k"){
         location.href =  dir_nt2k;
   } else if (dir == "vista"){
         location.href =  dir_vista;
   } else if (dir == "docpop"){
         location.href =  dir_docpop;
   }
 }