var flag1=1;
	var flag2=1;
	var flag3=1;
function show(v){
if(v==1)
	{
	if(flag1==1){
		document.getElementById("div1").style.display = "none";
		flag1=0;}
	else{document.getElementById("div1").style.display = "block";
		flag1=1;}
	}
	
if(v==2)
	{
	if(flag2==1){
		document.getElementById("div2").style.display = "none";
		flag2=0;}
	else{document.getElementById("div2").style.display = "block";
		flag2=1;}
	}
	
if(v==3)
	{
	if(flag3==1){
		document.getElementById("div3").style.display = "none";
		flag3=0;}
	else{document.getElementById("div3").style.display = "block";
		flag3=1;}
	}
	
}