// JScript 文件
var currentpos,timer;
function initializeScroll() 
{ 
    timer=setInterval("scrollwindow()",50);
} 
function scrollclear()
{
    clearInterval(timer);
}
function scrollwindow() 
{
    currentpos=document.documentElement.scrollTop;
    window.scroll(0,++currentpos);
    if (currentpos != document.documentElement.scrollTop) 
        scrollclear();
} 
document.onmousedown=scrollclear;
document.ondblclick=initializeScroll;