function history_display(obj)
{
	document.getElementById('all').style.display="none";
	document.getElementById('groups').style.display="none";
	document.getElementById('comments').style.display="none";
	document.getElementById('chroniqs').style.display="none";
	document.getElementById('videos').style.display="none";
	document.getElementById('photos').style.display="none";
	document.getElementById('questions').style.display="none";
	
	document.getElementById(obj).style.display="";
}