Blend an easing function with a linear function in jQuery

jquery-linear-blend-ease.js

(function($){
    /**
     * Creates a version of the specified easing function averaged with linear
     * easing at the specified weight
     *
     * @param  name of original easing function
     * @param  weight of easing function (default 0.5)
     * @return name of rounded easing function
     */
    $.linearBlendEase = function ( fn, weight )
    {
        weight = weight || 0.5;
        var fnBlend = fn + 'Blend' + weight;
        // If the function does not exist yet, create it first
        if ( typeof $.easing[fnBlend] !== 'function' )
        {
            $.easing[fnBlend] = function (x, t, b, c, d) {
                return weight * $.easing[fn](x, t, b, c, d ) + ( 1 - weight ) * ( c * t / d + b );
            };
        }
        // And use it!
        return fnBlend;
    };
})(jQuery);