cnt = 0;
function changeImage() {

	cnt++;
    cnt %= 6;
	line = 4;
	mes = new Array(6);
	mes[0] ='<img src="images/index/img_main_020.jpg">';
	mes[1] ='<img src="images/index/img_main_021.jpg">';
	mes[2] ='<img src="images/index/img_main_022.jpg">';
	mes[3] ='<img src="images/index/img_main_023.jpg">';
	mes[4] ='<img src="images/index/img_main_024.jpg">';
	mes[5] ='<img src="images/index/img_main_025.jpg">';
	
	document.getElementById('TopImage').innerHTML = mes[cnt];
}