$.fn.makeFadeRollOver = function( ) {
    this.each(function(){
        var $this = $(this);
        var $element = $(this).find('img');
        $this.hover(function(e) {
            $element.animate({opacity: 0 }, 250);
        }, function() {
            $element.stop().animate({opacity: 1 }, 250);
        });
    });
}