function roll(start_num, end_num, item_type, wait_time) {
	
	if(document.getElementById("flag").value != "yes") {
		prev_num = start_num-1
		p = document.getElementById(item_type+prev_num);
		if(p != null) {
			p.style.display = "none";
		}
		p = document.getElementById(item_type+end_num);
		if(p != null) {
			p.style.display = "none";
		}
		e = document.getElementById(String(item_type+start_num));
		e.style.display = "inline";
		start_num = start_num +1;
	}
	if(start_num <= end_num) {
		window.setTimeout('roll('+start_num+', '+end_num+', "'+item_type+'", '+wait_time+');', wait_time);
	} else {
		window.setTimeout('roll(1, '+end_num+', "'+item_type+'", '+wait_time+');', wait_time);
	}
}