jQuery.fn.fadeIn = function(speed, callback) {
    return this.animate({ opacity: 'show' }, speed, function() {
        if (jQuery.browser.msie)
            this.style.removeAttribute('filter');
        if (jQuery.isFunction(callback))
            callback();
    });
};

jQuery.fn.fadeOut = function(speed, callback) {
    return this.animate({ opacity: 'hide' }, speed, function() {
        if (jQuery.browser.msie)
            this.style.removeAttribute('filter');
        if (jQuery.isFunction(callback))
            callback();
    });
};

jQuery.fn.fadeTo = function(speed, to, callback) {
    return this.animate({ opacity: to }, speed, function() {
        if (to == 1 && jQuery.browser.msie)
            this.style.removeAttribute('filter');
        if (jQuery.isFunction(callback))
            callback();
    });
};