function overload => using arguments

function FindWord()
{
    var haystack = document.getElementById("problem3A").value;
    var needle = document.getElementById("problem3B").value;
    var caseSensitive = document.getElementById("problem3C").value;
    //check for case sensitive
    var result;
    if (caseSensitive == "case sensitive") {
        result = Check(haystack, needle, "sensitive");
    } else {
        result = Check(haystack, needle);
    }
    //print
    cons.innerHTML = result;

    //function overload
    function Check(haystack, needle, sensitive)
    {
        var arr = [];
        arr = haystack.split(" ");
        if (arr.indexOf(needle) > -1) {
            return true;
        }
        return false;
    }
    //always runs this function - in java script no function overloads :)
    function Check(haystack, needle)
    {
        if (arguments.length == 2) {
            haystack = haystack.toLowerCase();
            needle = needle.toLowerCase();
        }
        var arr = [];
        arr = haystack.split(" ");
        if (arr.indexOf(needle) > -1) {
            return true;
        }
        return false;
    }
}