var arrImages = new Array("top_img/main_01.jpg","top_img/main_02.jpg", "top_img/main_03.jpg", "top_img/main_04.jpg","top_img/main_05.jpg")
var nNumber = 0;

function showImage(){
	sImageName = arrImages[nNumber];
	document.imgSample.src = sImageName;
	if (nNumber >= arrImages.length - 1)
	{
		nNumber = 0;
	}
	else
	{
		nNumber++;
	}
	setTimeout(showImage, 10000);
}