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var currentpos,timer; 
function initializeScroll() { timer=setInterval("scrollwindow()",80);} 
function scrollclear(){clearInterval(timer);}
function scrollwindow() {currentpos=document.body.scrollTop;window.scroll(0,++currentpos);if (currentpos != document.body.scrollTop) scrollclear();} 
document.onmousedown=scrollclear
document.ondblclick=initializeScroll
-->