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('auburn').style.display = "none";
	document.getElementById('northampton').style.display = "none";
	document.getElementById('bellingham').style.display = "none";
	document.getElementById('brockton').style.display = "none";
	document.getElementById('bedford').style.display = "none";
	document.getElementById('gloucester').style.display = "none";
	document.getElementById('haverhill').style.display = "none";
	document.getElementById('methuen').style.display = "none";
	document.getElementById('plymouth').style.display = "none";
}