function showa(num){
	hideall();
	document.getElementById('a'+num).className = "tag_1";
	document.getElementById('s'+num).style.display = "";
	if(num == 2){
	document.getElementById('pageli').style.display = "";
	}
}
function hideall(){

	document.getElementById('a1').className = "tag_2";
	document.getElementById('a2').className = "tag_2";

	document.getElementById('s1').style.display = "none";
	document.getElementById('s2').style.display = "none";
}