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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Random Word Generator</title>
    <script language="javascript" type="text/javascript">

        var validCharacters = new Array();
        validCharacters[0] = "a";
        validCharacters[1] = "b";
        validCharacters[2] = "c";
        validCharacters[3] = "d";
        validCharacters[4] = "e";
        validCharacters[5] = "f";
        validCharacters[6] = "g";
        validCharacters[7] = "h";
        validCharacters[8] = "i";
        validCharacters[9] = "j";
        validCharacters[10] = "k";
        validCharacters[11] = "l";
        validCharacters[12] = "m";
        validCharacters[13] = "n";
        validCharacters[14] = "o";
        validCharacters[15] = "p";
        validCharacters[16] = "q";
        validCharacters[17] = "r";
        validCharacters[18] = "s";
        validCharacters[19] = "t";
        validCharacters[20] = "u";
        validCharacters[21] = "v";
        validCharacters[22] = "w";
        validCharacters[23] = "x";
        validCharacters[24] = "y";
        validCharacters[25] = "z";

        function randomiser() {
            var outputDiv = document.getElementById("output");

            var numberOfWords = document.forms[0].numberOfWords.value;
            var wordPattern = document.forms[0].wordPattern.value;

            outputDiv.innerHTML = "";

            var randomWordsHTML = "";


            for (var i = 1; i <= numberOfWords; i++) {
                var randomWord = generateRandomWord(wordPattern);

                randomWordsHTML += randomWord + "<br />";
            }

            outputDiv.innerHTML = randomWordsHTML;
        }

        function generateRandomWord(wordPattern) {
            var randomWord = "";
            var wordLength = wordPattern.length;

            for (var i = 0; i < wordLength; i++) {
                if (wordPattern.charAt(i) == "l") {
                    randomWord += validCharacters[getRandomNumber(25)];
                } else if (wordPattern.charAt(i) == "n") {
                    randomWord += getRandomNumber(9);
                }
            }

            return randomWord;
        }


        function getRandomNumber(max) {
            return Math.floor(Math.random() * (max + 1));
        }
    </script>
</head>
<body>
<form action="#">
Number of words: <input type="text" name="numberOfWords" />
<br />
Word pattern: <input type="text" name="wordPattern" /> (eg. lllnn, will generate words of length 5 made of 3 letters ('l') and 2 numbers ('n'))
<br />
<input type="button" name="randomise" value="Generate Random Words" onclick="randomiser();" />
</form>
<br />
<h2>Output</h2>
<hr />
<div id="output">
</div>
</body>
</html>