function displayScreen(elementId)
{
	document.getElementById("st").style.display = "none";
	document.getElementById("ci").style.display = "none";
	document.getElementById("cb").style.display = "none";
	document.getElementById("ad").style.display = "none";
	document.getElementById("ex").style.display = "none";
	document.getElementById("pos").style.display = "none";
	document.getElementById("pack").style.display = "none";
	document.getElementById("ill").style.display = "none";
	document.getElementById("pub").style.display = "none";
	document.getElementById("stat").style.display = "none";
	
	document.getElementById(elementId).style.display = "block";
}