jQuery.fn.slideFadeToggle = function(speed, easing, callback) {
        return this.animate({opacity: 'toggle', height: 'toggle'}, speed, easing, callback);  
    };
        
    jQuery(document).ready(function()
    {   
        jQuery(".btnNewsletter").click(function() 
        { 
            jQuery("#pnlNewsletter").slideFadeToggle('slow');
        }
        );
        
        $("#pnlNewsletter > div > a").click(function()
        {
            jQuery("#pnlNewsletter").slideFadeToggle('slow');
        });
    });