CSS webpage color, line-by-line color change, tab, div scroll bar

From:
Several ultra-refreshing CSS web page color schemes

Http://www.codefans.net/jscss/code/602.shtml

Ajax tab, line separation color change, pop-up layer
Http://www.codefans.net/jscss/code/1606.shtml

Div scroll bar

Http://zhidao.baidu.com/question/122145038.html? Fr = cpush

Div can be rolled with a scroll axis but does not want to display the scroll bar. How can this problem be solved?

Overflow in the DIV style: Scroll can be rolled, but the scroll bar will appear (do not want to show the scroll bar) with overflow: hidden does not show the scroll bar but cannot use the scroll axis, hope you can help solve it

How does JS monitor the mouse wheel?