function show_bookmark1(n){
var x = "b" + n;
	document.getElementById("b1").className = "headlink";
	document.getElementById("b2").className = "headlink";
	document.getElementById("b3").className = "headlink";
	
	document.getElementById("howWork1").style.display = "none";
	document.getElementById("howWork2").style.display = "none";
	document.getElementById("howWork3").style.display = "none";

	document.getElementById(x).className = "headlink active";
	document.getElementById("howWork"+n).style.display = "block";
	
 return false;
}

function show_bookmark2(n){
var x = "b" + n;
	document.getElementById("b4").className = "headlink";
	document.getElementById("b5").className = "headlink";
	document.getElementById("b6").className = "headlink";

  document.getElementById("popular4").style.display = "none";
	document.getElementById("popular5").style.display = "none";
	document.getElementById("popular6").style.display = "none";

	document.getElementById(x).className = "headlink active";
	document.getElementById("popular"+n).style.display = "block";
 return false;
}

function show_bookmark_Login(n)
{
  var x = "header" + n;
	document.getElementById("headerLogin").className = "headlink";
	document.getElementById("headerJoin").className = "headlink";

  document.getElementById("tabLogin").style.display = "none";
	document.getElementById("tabLogin").style.display = "none";

	document.getElementById(x).className = "headlink active";
	document.getElementById("tab"+n).style.display = "block";
 return false;
}