CSS web page color matching, interlaced color changing, tabs, Div scroll bar_html/css_WEB-ITnose

Excerpted from:
Several super refreshing CSS web color schemes
http://www.codefans.net/jscss/code/602.shtml

Ajax Tabs, interlaced color changing, pop-up layer
http://www.codefans.net/jscss/code/1606.shtml

Div scroll bar
http://zhidao.baidu.com/question/122145038.html?fr=cpush

How to make a div that can be scrolled with a roller but does not want to display the scroll bar

Adding overflow:scroll to the div style can scroll, but the scroll bar will appear (I don’t want the scroll bar to appear). Using overflow:hidden will not appear the scroll bar, but the roller cannot be used. I hope experts can help solve it.

How to implement js monitoring of mouse wheel?