function callCity(location){
	// hide all city-containers
	hideAll();
	// display the appropriate container
	document.getElementById(location).style.display = "block";
}

function highlightCity(elementID) {
	var element = document.getElementById(elementID);
	element.setAttribute("class", "city-highlight"); 
}

function highlightCityOff(elementID) {
	var element = document.getElementById(elementID);
	element.setAttribute("class", "city-highlight-off"); 
}

function hideAll() {
	// hide all city-containers
	document.getElementById('concord').style.display = "none";
	document.getElementById('exeter').style.display = "none";
	document.getElementById('gilford').style.display = "none";
	document.getElementById('lebanon').style.display = "none";
	document.getElementById('nashua').style.display = "none";
	document.getElementById('manchester').style.display = "none";
}