function showMenu(menuName,imgName,menuNum){
	var menu = document.getElementById(menuName);
	var image = document.getElementById(imgName);
	if(menu.style.display=='none'){
		for(i=1;i<=menuNum;i++){
			document.getElementById("ol"+i).style.display='none';
			document.getElementById("img"+i).src='/images/dot0.png';
		}
		menu.style.display='';
		image.src='/images/dot.png';
	}
	else{
		menu.style.display='none';
		image.src='/images/dot0.png';
	}
}