<SCRIPT language=JavaScript type=text/javascript><!--
     with (document) {
      writeln('<form name=myform>' +
      '<input name=upper type=checkbox value=0> <b>Заглавные буквы (A-Z)</b><br>' +
      '<input name=lower type=checkbox value=1> <b>Маленькие буквы (a-z)</b><br>' +
      '<input name=digit type=checkbox value=2> <b>Цифры (0-9)</b><br><br>Число символов в пароле (3-15): ' +
      '<select name=numbers><option value=3 selected>3</option>');
      for (j = 4; j <= 15; j++) { writeln('<option value=' + j + '>' + j + '</option>'); }
      writeln('</select><br><br>' +
      '<input type=button value=Генерировать ... onClick=generate()><br><br>Ваш пароль:<br>' +
      '<input name=getback size=30 type=text value=""></form>');
     }
     // массивы символов
     upp = new Array('','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');
     low = new Array('','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z');
     dig = new Array('','0','1','2','3','4','5','6','7','8','9');
     // --------------------------------------------------------------------------------------------------------------------------------------------    ------------------
      function rnd(x,y,z) {     
      var num;
      do {
       num = parseInt(Math.random()*z);
       if (num >= x && num <= y) break;
      } while (true);
     return(num);
     }
     // --------------------------------------------------------------------------------------------------------------------------------------------    ------------------
     function genArray() {                      
      var pwd = '';
      var res, s;
      var k = 0;
      var n = document.myform.numbers.value;
      var pass = new Array();
      var w = rnd(30,80,100);
      for (var r = 0; r < w; r++) {
       if (myform.upper.checked) { res = rnd(1,26,100); pass[k] = upp[res]; k++; }
       if (myform.lower.checked) { res = rnd(1,26,100); pass[k] = low[res]; k++; }
       if (myform.digit.checked) { res = rnd(1,10,100); pass[k] = dig[res]; k++; }
      }
      for (var i = 0; i < n; i++) {
       s = rnd(1,k-1,100);
       pwd+= pass[s];
      }
      document.myform.getback.value = pwd;
     }
     // --------------------------------------------------------------------------------------------------------------------------------------------    ------------------
     function generate() {
      if (myform.upper.checked || myform.lower.checked || myform.digit.checked)  { genArray(); }
      else { alert('Должен быть выбран тип символов!'); myform.upper.checked = true; }
     }
     //--></script>