$(function () {
$('a.menu_class').click(function () {
$('div#login-form').toggle();
return false;
});
// OPACITY OF BUTTON SET TO 50%
$(".top-bar-image").css("opacity","0.5");
// ON MOUSE OVER
$(".top-bar-image").hover(function () {									  
// SET OPACITY TO 100%
$(this).stop().animate({
opacity: 1.0
}, "medium");
},		
// ON MOUSE OUT
function () {		
// SET OPACITY BACK TO 50%
$(this).stop().animate({
opacity: 0.5
}, "slow");
});
});