function firsttab()
{
	document.getElementById("firstTab").style.display="block";
	document.getElementById("secondTab").style.display="none";
	
	document.getElementById("firstContent").style.display="block";
	document.getElementById("secondContent").style.display="none";
}
  
function secondtab()
{
	document.getElementById("firstTab").style.display="none";
	document.getElementById("secondTab").style.display="block";
	
	document.getElementById("firstContent").style.display="none";
	document.getElementById("secondContent").style.display="block";
}