var timer_id;
function scroll_iframe(frm,inc,dir) {
if (timer_id) clearTimeout(timer_id);
if (window.frames[frm]) {
if (dir == "v") window.frames[frm].scrollBy(0, inc);
else window.frames[frm].scrollBy(inc, 0);
timer_id = setTimeout("scroll_iframe('" + frm + "'," + inc + ",'" + dir + "')", 20);
}
}

function stopScroll() { if (timer_id) clearTimeout(timer_id); }