function hideDisplay(d,p) {
	var i=1;
	for (i=1;i<=4;i++) {
		document.getElementById('ref_'+i).style.display = "none";
		document.getElementById('p'+i).style.display = "none";
	}
	document.getElementById(d).style.display = "block";
	document.getElementById(p).style.display = "block";
}