function displayLocation(location){
	// hide all image divs
	hideAll();
	// display the appropriate div
	document.getElementById(location).style.display = "block";	
}
function hideAll() {
	// hide all image divs
	document.getElementById('andover').style.display = "none";	
	document.getElementById('bedford').style.display = "none";	
	document.getElementById('canton').style.display = "none";	
	document.getElementById('medford').style.display = "none";		
	document.getElementById('westwood').style.display = "none";
	document.getElementById('winchester').style.display = "none";	
	document.getElementById('natick').style.display = "none";	
	document.getElementById('cambridge').style.display = "none";		
}
function initialize() {
	// hide all image divs except the initial one
	document.getElementById('andover').style.display = "block";	
	document.getElementById('bedford').style.display = "none";	
	document.getElementById('canton').style.display = "none";	
	document.getElementById('medford').style.display = "none";	
	document.getElementById('westwood').style.display = "none";	
	document.getElementById('winchester').style.display = "none";	
	document.getElementById('natick').style.display = "none";	
	document.getElementById('cambridge').style.display = "none";	
}
window.onload = initialize;