Anagrams of a word

HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>

<input type="text" id="my_number" placeholder="Number" style="margin-bottom: 5px;"/><br />
            <input type="text" id="my_text" placeholder="Letters" style="margin-bottom: 5px;"/><br/>
            <span id="my_word"></span><br />
            <input type="button" id="my_btn" value="Submit" onclick="GenerateAnagrams();" />

JavaScript

function generateAnagrams(word, number) {

        if (word.length < 2) {

            return [word];

        } else {

            // By declaring all variables outside of the loop,
            // we improve efficiency, avoiding the needless
            // declarations each time.

            var anagrams = [];
            var before, focus, after;
            var shortWord, subAnagrams, newEntry;

            for (var i = 0; i < word.length; i++) {

                before = word.slice(0, i);
                focus = word[i];
                after = word.slice(i + 1, word.length + 1);
                shortWord = before + after;
                subAnagrams = generateAnagrams(shortWord, number);

                for (var j = 0; j < subAnagrams.length; j++) {

                    newEntry = focus + subAnagrams[j];
                    newEntry = newEntry.substr(0, number);
                    anagrams.push(newEntry);

                }

            }
            //Remove all duplicate letters from array
            //This prevent substr above from generate
            anagrams = unique(anagrams);
            return anagrams;

        }

    }

    function unique(list) {
        var result = [];
        $.each(list, function (i, e) {
            if ($.inArray(e, result) == -1) result.push(e);
        });
        return result;
    }

    
    function GenerateAnagrams() {
        var number = $("#my_number").val();
        var word = $("#my_text").val();
        var result = generateAnagrams(word, number);
        $("#my_word").text(result);
    }