function s1(){
		
		document.getElementById("content1").style.display="block";
		document.getElementById("content2").style.display="none";
		document.getElementById("content3").style.display="none";
		document.getElementById("s1").className="s1";
		document.getElementById("s2").className="";
		document.getElementById("s3").className="";
	}

	function s2(){
	
		document.getElementById("content1").style.display="none";
		document.getElementById("content2").style.display="block";
		document.getElementById("content3").style.display="none";
		document.getElementById("s1").className="";
		document.getElementById("s2").className="s1";
		document.getElementById("s3").className="";
	}

	function s3(){
	
		document.getElementById("content1").style.display="none";
		document.getElementById("content2").style.display="none";
		document.getElementById("content3").style.display="block";
		document.getElementById("s1").className="";
		document.getElementById("s2").className="";
		document.getElementById("s3").className="s1";
	}