var currentpos,timer; 
function initialize() { 
timer=setInterval("scrollwindow()",16); 
document.all.imgdown.src="images/jiantouanxiadown.gif"
} 
function sc(){ 
clearInterval(timer); 
document.all.imgdown.src="images/jiantoudown.gif"
} 
function sc2(){ 
clearInterval(timer); 
document.all.imaup.src="images/jiantouup.gif"
} 
function scrollwindow() { 
currentpos=window.liebiao.document.body.scrollTop; 
window.liebiao.scroll(0,++currentpos); 
} 
function initialize2() { 
timer=setInterval("scrollwindow2()",16); 
document.all.imaup.src="images/jiantouanxiaup.gif"
} 
function scrollwindow2() { 
currentpos=window.liebiao.document.body.scrollTop; 
window.liebiao.scroll(0,--currentpos); 
} 




function imgResize(obj){ 
if (obj.width/obj.parentElement.width >= obj.height/obj.parentElement.height ) 
{ 
if (obj.width>obj.parentElement.width) 
{ 
obj.width = obj.parentElement.width; 
} 
} 
else 
{ 
if (obj.height>obj.parentElement.height) 
{ 
obj.height = obj.parentElement.height; 
} 
} 
}