var mode=0

function blinkscroll() {
	if (mode==0)
		document.body.style.scrollbarArrowColor="#616161"
	else
		document.body.style.scrollbarArrowColor="#C4C4C4"
		mode=(mode==0)? 1 : 0
}

blinkArrows = setInterval("blinkscroll()", 100);

setTimeout("clearInterval(blinkArrows); mode=1; blinkscroll();", 1500);