function pbook(id){
		if(id==1){
		document.getElementById('pbook_1').className="btn01";
		document.getElementById('pbook_2').className="btn02";
		document.getElementById('pbook_1c').style.display="block";
		document.getElementById('pbook_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('pbook_1').className="btn02";
		document.getElementById('pbook_2').className="btn01";
		document.getElementById('pbook_1c').style.display="none";
		document.getElementById('pbook_2c').style.display="block";
		}
		}