function displayScreen(elementId)
{
	document.getElementById("publicrelationscontainer").style.display = "none";
	document.getElementById("expertwrittingcontainer").style.display = "none";
	document.getElementById("mediamanagementcontainer").style.display = "none";
	document.getElementById("campaignplanningcontainer").style.display = "none";
	document.getElementById("digitalmediacontainer").style.display = "none";
	document.getElementById("eventmanagementcontainer").style.display = "none";
	
	document.getElementById(elementId).style.display = "block";
}