var  sup,sdn,pdiv,scrolling=false;
window.onload=function(){
sup=document.getElementById("popup_scroll_up");
sdn=document.getElementById("popup_scroll_down");
pdiv=document.getElementById("popup_thumbs");
}


function showScrolls(a)
{
	if(sup)
	{
		if(a=='a')
		{
			sup.style.display="block";
			sdn.style.display="block";
		}
		else
		{
			sup.style.display="none";
			sdn.style.display="none";
		}
	}
}

function scroll(a)
{
    scrolling=true;
    scrollX(a);
}
function scrollX(a)
{
if(!scrolling)
{
    return ;
}
if(a=="dn")
{
   pdiv.scrollTop += 5;

}
else
{
    pdiv.scrollTop -= 5;
}
   window.setTimeout("scrollX('"+a+"')", 10);
}
function stop_scroll()
{
    scrolling=false;
}