Change ul style when arriving to div(scrolling)

Question

I would like to change a ul style on scrolling and arrive to div using jQuery, explanation down.

CSS:

#menu {
    background-color:#ccc;
    position         


        

Answer 1

Yes, you need jQuery, but I do not understand: You must apply menutext2 class when the scroll bars to see div1 or when you click div1?

set event (click or scroll and apply)

$('.menu').removeClass('menutext').addClass('menutext2');