function layerswich(layernumber){

	//������
	document.getElementById("chiki1").style.backgroundImage = "";
	document.getElementById("chiki2").style.backgroundImage = "";
	document.getElementById("chiki3").style.backgroundImage = "";
	document.getElementById("chiki4").style.backgroundImage = "";
	document.getElementById("chiki5").style.backgroundImage = "";
	document.getElementById("chiki6").style.backgroundImage = "";
	document.getElementById("chiki7").style.backgroundImage = "";

	j1=document.getElementById("area1");
	j2=document.getElementById("area2");
	j3=document.getElementById("area3");
	j4=document.getElementById("area4");
	j5=document.getElementById("area5");
	j6=document.getElementById("area6");
	j7=document.getElementById("area7");
	if(layernumber == "area1"){
		j1.style.display='block';
		j2.style.display='none';
		j3.style.display='none';
		j4.style.display='none';
		j5.style.display='none';
		j6.style.display='none';
		j7.style.display='none';
		document.getElementById("chiki1").style.backgroundImage = "url('/images/p/menu_city_1_p.png')";
	}else if(layernumber == "area2"){
		j1.style.display='none';
		j2.style.display='block';
		j3.style.display='none';
		j4.style.display='none';
		j5.style.display='none';
		j6.style.display='none';
		j7.style.display='none';
		document.getElementById("chiki2").style.backgroundImage = "url('/images/p/menu_city_2_p.png')";
	}else if(layernumber == "area3"){
		j1.style.display='none';
		j2.style.display='none';
		j3.style.display='block';
		j4.style.display='none';
		j5.style.display='none';
		j6.style.display='none';
		j7.style.display='none';
		document.getElementById("chiki3").style.backgroundImage = "url('/images/p/menu_city_3_p.png')";
	}else if(layernumber == "area4"){
		j1.style.display='none';
		j2.style.display='none';
		j3.style.display='none';
		j4.style.display='block';
		j5.style.display='none';
		j6.style.display='none';
		j7.style.display='none';
		document.getElementById("chiki4").style.backgroundImage = "url('/images/p/menu_city_4_p.png')";
	}else if(layernumber == "area5"){
		j1.style.display='none';
		j2.style.display='none';
		j3.style.display='none';
		j4.style.display='none';
		j5.style.display='block';
		j6.style.display='none';
		j7.style.display='none';
		document.getElementById("chiki5").style.backgroundImage = "url('/images/p/menu_city_5_p.png')";
	}else if(layernumber == "area6"){
		j1.style.display='none';
		j2.style.display='none';
		j3.style.display='none';
		j4.style.display='none';
		j5.style.display='none';
		j6.style.display='block';
		j7.style.display='none';
		document.getElementById("chiki6").style.backgroundImage = "url('/images/p/menu_city_6_p.png')";
	}else if(layernumber == "area7"){
		j1.style.display='none';
		j2.style.display='none';
		j3.style.display='none';
		j4.style.display='none';
		j5.style.display='none';
		j6.style.display='none';
		j7.style.display='block';
		document.getElementById("chiki7").style.backgroundImage = "url('/images/p/menu_city_7_p.png')";
	}else{
		j1.style.display='none';
		j2.style.display='none';
		j3.style.display='none';
		j4.style.display='none';
		j5.style.display='none';
		j6.style.display='none';
		j7.style.display='block';
		document.getElementById("chiki7").style.backgroundImage = "url('/images/p/menu_city_7_p.png')";
	}
}