function p1()
{	
	document.getElementById("selpage1").className = "sel";
	document.getElementById("selpage2").className = "unsel";
	document.getElementById("selpage3").className = "unsel";
	document.getElementById("page1").style.display = "block";
	document.getElementById("page2").style.display = "none";
	document.getElementById("page3").style.display = "none";
}
function p2()
{	
	document.getElementById("selpage1").className = "unsel";
	document.getElementById("selpage2").className = "sel";
	document.getElementById("selpage3").className = "unsel";
	document.getElementById("page1").style.display = "none";
	document.getElementById("page2").style.display = "block";
	document.getElementById("page3").style.display = "none";
}
function p3()
{	
	document.getElementById("selpage1").className = "unsel";
	document.getElementById("selpage2").className = "unsel";
	document.getElementById("selpage3").className = "sel";
	document.getElementById("page1").style.display = "none";
	document.getElementById("page2").style.display = "none";
	document.getElementById("page3").style.display = "block";
}