function photoScrollMove(moveF,moveV,EA) {
		var prdScrollList=document.getElementById("imgS");

		var prdScrollTop = prdScrollList.style.top;
		prdScrollTop = parseInt(prdScrollTop.replace("px",""));

		photoScrollHeight = prdScrollList.style.height;
		photoScrollHeight = parseInt(photoScrollHeight.replace("px",""));
		photoScrollHeight = -(photoScrollHeight + (moveV*EA));

		if (moveF == "U") {
			if (prdScrollTop !=0)	{
				prdScrollList.style.top = prdScrollTop + moveV + "px";
			}
			else	{
				alert("no more image");
			}
		}
		else	{
			
			if (prdScrollTop > photoScrollHeight)	{
				prdScrollList.style.top = prdScrollTop + moveV + "px";
			}
			else	{
				alert("no more image");
			}
		}
	}