function nswitchTag(nmenutag,nmenucontent,nmenuk) {
	 for(i=1; i <6; i++) {
		 if (nmenuk==5) {
		 			document.getElementById("nmenu5").className="nnavOn";
		 			document.getElementById("nmenu4").className="nnavNo";
		 			document.getElementById("nmenu3").className="nnavNo";
		 			document.getElementById("nmenu2").className="nnavNo";
		 			document.getElementById("nmenu1").className="nnavNo";
			 		document.getElementById("nsliding5").className="nsliding";
			 		document.getElementById("nsliding4").className="nsliding_none";
			 		document.getElementById("nsliding3").className="nsliding_none";
			 		document.getElementById("nsliding2").className="nsliding_none";
			 		document.getElementById("nsliding1").className="nsliding_none";
			 		document.getElementById("zixuan").className="nsliding_none";
			 		continue;
		 }
		 
		 if (i==nmenuk) {
		 	changeDy();
		 	changeFangAn();
			dingyiTaoCan(nmenuk);	 	
		 			document.getElementById(nmenutag+i).className="nnavOn";document.getElementById(nmenucontent+i).className="nsliding";
					 document.getElementById("zixuan").className="nsliding";
		 }
		 else {
		 			document.getElementById(nmenutag+i).className="nnavNo";document.getElementById(nmenucontent+i).className="nsliding_none";
		 			 document.getElementById("zixuan").className="nsliding";
		 }
		 }
 }