function OnClick(id){
	// default
	document.getElementById('tab1').style.display = 'none';
	document.getElementById('tab2').style.display = 'none';
	document.getElementById('tab3').style.display = 'none';
	document.getElementById('tab4').style.display = 'none';
	document.getElementById('tab5').style.display = 'none';
	document.getElementById('ltab1').className = "bt";
	document.getElementById('ltab2').className = "bt";
	document.getElementById('ltab3').className = "bt";
	document.getElementById('ltab4').className = "bt";
	document.getElementById('ltab5').className = "bt";
	// Show Block
	var object = document.getElementById(id);
	if(object.style.display == 'none'){	object.style.display = 'block';	}
	else{					object.style.display = 'none';	}
	// Mark Menu
	object = document.getElementById("l" + id);
	if(object.className == "bt_act"){	object.className = "bt";	}
	else{					object.className = "bt_act";}
}