gistfile1.js

if (!Array.prototype.indexOf)
{
    Array.prototype.indexOf = function( search, from )
    {
        var len = this.length;
        from = ~~from || 0;
        if (from < 0){ from += len; }

        for (; from < len; from++){
            if (this[from] === search){ return from; }
        }

        return -1;
    };
}