// yea IE!
if (!Array.prototype.indexOf)
{
    Array.prototype.indexOf = function (searchElement /*, fromIndex */)
    {
        "use strict";

        if (this === void 0 || this === null)
            throw new TypeError();

        var t = Object(this);
        var len = t.length >>> 0;
        if (len === 0)
            return -1;

        var n = 0;
        if (arguments.length > 0)
        {
            n = Number(arguments[1]);
            if (n !== n) // shortcut for verifying if it's NaN
                n = 0;
            else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0))
                n = (n > 0 || -1) * Math.floor(Math.abs(n));
        }

        if (n >= len)
            return -1;

        var k = n >= 0
          ? n
          : Math.max(len - Math.abs(n), 0);

        for (; k < len; k++)
        {
            if (k in t && t[k] === searchElement)
                return k;
        }
        return -1;
    };
}