function choice(arg)
//return random index number in valid range of arg array
{
        return Math.floor(Math.random()*arg.length);
}

function randstr(arg) 
//return random argument of arg array
{
var str = '';
var seed = choice(arg);
        str = arg[seed];
return str;
}

function initialize()
//use actual time to initialize random function as javascript doesn't provide an initialization function itself
//to get more random, use getMilliseconds() function 
//don't use getTime() as it produces numbers larger than 1000 billions, eheh
{
        var count=new Date().getSeconds();
        for (c=0; c<count; c++)
                Math.random();
}

function mkpass() 
{
        //use of initialize() can decrease speed of script. On really slow systems, disable it.
        initialize(); 

        //password length
        var pass_len=6;

        var cons_lo = ['b','c','d','f','g','h','j','k','l','m','n','p','q','r','s','t','v','w','x','y','z'];
        var cons_up = ['B','C','D','F','G','H','J','K','L','M','N','P','Q','R','S','T','V','W','X','Y','Z'];
        var hard_cons_lo = ['b','c','d','f','g','h','k','m','p','s','t','v','z'];
        var hard_cons_up = ['B','C','D','F','G','H','K','M','P','S','T','V','Z'];
var link_cons_lo = ['h','l','r']; 
var link_cons_up = ['H','L','R']; 
var vowels_lo = ['a','e','i','o','u'];
var vowels_up = ['A','E','I','U']; //O (letter o) and 0 (number zero) get confused
        var digits = ['1','2','3','4','5','6','7','8','9'];

        //change at will how many times digits appears in names array. Order doesn't matter
        var names = [cons_lo, cons_up, digits, hard_cons_lo, hard_cons_up, digits, link_cons_lo, link_cons_up, digits, vowels_lo, vowels_up, digits];

var newpass= '';
        for(i=0; i<pass_len; i++)
         newpass = newpass + randstr(names[choice(names)]);

document.getElementById("pass").innerHTML = '<font style=color:blue;background-color:#ffeeff; size=5><i>'+ newpass +'</i></font>';
document.getElementById("qbtcode").value = newpass;
}