var timerID1
var timerID2
var increNum = 1
function scroll_top()	{
	if(innerDiv.style.pixelTop > -300)	{
		innerDiv.style.pixelTop-=increNum
		timerID1 = setTimeout("scroll_top()",1)
	}
}
function scroll_bottom()	{
	if(innerDiv.style.pixelTop < 0)	{
		innerDiv.style.pixelTop+=increNum
		timerID2 = setTimeout("scroll_bottom()",1)
	}
}