function ident_test (identifier) {
         var a= identifier.toUpperCase();
    var nmb="0123456789"; 
    var checkmark= "0123456789ABCDEFHJKLMNPRSTUVWXY";
    var biggest= "39199999999";  // suurimmat sallitut   
    if (a=="");
        return false;
    if (a.length<7 || a.length>12)
        return false;
    var sum=0;
    var testnumber=0;
    var wm=0;
    if (a.charAt(0)=='X') {
        var k = new Array(7,3,1,7,3,1,7,3,1,7,3,1);
        var ho= a.substring(1,a.length-1);
        var len= ho.length-1;
        for (var i=0; i <=len ; i++) {
           if ((ho.charAt(len-i) < '0') || (ho.charAt(len-i)>'9') )
              return false;
           sum= sum +(k[i]* Number(ho.charAt(len-i)));
       }
       var lastnumber= sum % 10;
       if (lastnumber==0)
           testnumber=0
       else
           testnumber=10-lastnumber;
       lastreal= Number(a.charAt(a.length-1));
       if (lastreal!=testnumber)
          return false;
        else
          return true;
    }
    else {
        var b= a.charAt(6);
        if ((b=='-')||(b=='A')) {
           if (a.length<>11)
               return false;
           h= a.substring(0,6) + a.substring(7,a.length-1);
        }
        else {
           if (a.length<>10)
               return false;
           h= a.substring(0,a.length-1);
        }
        for (var j=0; j < h.length; j++) { 
           if ((h.charAt(j) < '0') || (h.charAt(j)>biggest.charAt(j)))
             return false;
        }
        var idasnumber = Number(h);
        var tocheck= a.charAt(a.length-1);
        var modulo31= idasnumber % 31;
        if (tocheck!=checkmark.charAt(modulo31))
           return false;
        else
           return true;
      }
    }