function bianhuan1(num){
	fuwei2()
	if(num==1){
	document.getElementById("cx1").className="now";
	document.getElementById("cxnr1").style.display="block";
	}
	if(num==2){
	document.getElementById("cx2").className="now"
	document.getElementById("cxnr2").style.display="block";
	}
}

	function fuwei2(){		
	document.getElementById("cx1").className="";
	document.getElementById("cx2").className="";
	document.getElementById("cxnr1").style.display="none";
	document.getElementById("cxnr2").style.display="none";
	}