I have nothing to worry about. a original js image is rolling. First, let's look at the structure of the Static Page: copy the Code <body> <a href = "javascript: le () "> left </a> <a href =" javascript: re () "> right </a> <div id =" img "> <ul id =" imgul "> <li> </li> </li> <li> </li> </li> </ul> </div> </body> copy the two a labels on the code to control image scrolling. The key to the direction is the structure of div ul li . Inside the div is ul, then the img label in the div is li, which allows li to float and then adds a left and right margin to the div automatically. the general idea of rolling relative positioning of ul and absolute positioning of general layout is that, scroll by changing the left attribute of ul through css positioning and js timer. The following is the js Code: copy the Code <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">