// JavaScript Document
function jiaohu(i){
		switch(i){
			case 1:
			document.getElementById("layer01").style.display="block";
			document.getElementById("layer02").style.display="none";
			document.getElementById("layer03").style.display="none";
			document.getElementById("bg01").className="over4";
			document.getElementById("bg02").className="out4";
			document.getElementById("bg03").className="out4";
			break;
			case 2:
			document.getElementById("layer01").style.display="none";
			document.getElementById("layer02").style.display="block";
			document.getElementById("layer03").style.display="none";
			document.getElementById("bg01").className="out4";
			document.getElementById("bg02").className="over4";
			document.getElementById("bg03").className="out4";
			break;
			case 3:
			document.getElementById("layer01").style.display="none";
			document.getElementById("layer02").style.display="none";
			document.getElementById("layer03").style.display="block";
			document.getElementById("bg01").className="out4";
			document.getElementById("bg02").className="out4";
			document.getElementById("bg03").className="over4";

			break;

			
		}
	}