function prowerka()
   { var ret,ss,len;
  
     if (document.dann_client.elements[2].checked) return 1;
     ss = window.document.dann_client.em.value; ss = OswOtProb(ss); window.document.dann_client.em.value = ss;
     len = ss.length;
     if (len > 0) 
       { l = 0; for (i = 0; i < len; i++) if (ss.charAt(i) == '@') l++;
         if (l != 1) { alert('Error in an e-mail address !'); return 1; }
       }
     SakodirDann();
     return 0;
   }
  function OswOtProb(ssWx)
   { var len,i;
     var ssWix;

     if (ssWx == "") return ssWx;
     len = ssWx.length; ssWix = "";
     for (i = 0; i < len; i++) if (ssWx.charAt(i) != ' ') ssWix = ssWix + ssWx.substring(i,i+1);
     return ssWix;
   }
  function SakodirDann()
   { var ssFio,ssEm,ssWix;
     var SYMB_SAKAS = "|";

     ssFio = window.document.dann_client.fi.value;
     ssEm = window.document.dann_client.em.value;
     ssWix = Sk(ssFio) + SYMB_SAKAS + Sk(ssEm);
     window.document.dann_client.dann.value = ssWix;
   }
  function Sk(ssWx)
   { var ssWix;
     var len;

     len = ssWx.length;
     ssWix = ""; for (i = 0; i < len; i++) ssWix = ssWix + ssWx.charCodeAt(i) + "r";
     return ssWix;
   }