var clickCount = 0;

function slideLeft (){

	var itemCount = $('topicsList').getElementsByTagName("li").length;
	var displayCount = 4;//表示アイテム数
	var scrollItemCount = itemCount - displayCount;

	if (clickCount < scrollItemCount) {
	var leftMove = $('topicsListInner');
	new Effect.Move(leftMove, {duration: 0.4, x: -118, y: 0 });
	clickCount = clickCount+1;
	}
}
function slideRight (){

	var itemCount = $('topicsList').getElementsByTagName("li").length;
	var displayCount = 4;//表示アイテム数
	var scrollItemCount = itemCount - displayCount;

	if (clickCount > 0) {
	var rightMove = $('topicsListInner');
	new Effect.Move(rightMove, {duration: 0.4, x: 118, y: 0 });
	clickCount = clickCount-1;
	}
}