function callUnit(unitnumber){
	// hide all unit floorplans
	hideAll();
	// display the appropriate container
	document.getElementById(unitnumber).style.display = "block";
	document.getElementById(unitnumber + '-unit').className = "active";
}

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

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

function hideAll() {
	// hide all unit floorplans
	document.getElementById('a1').style.display = "none";
	document.getElementById('a1-unit').className = "";
	document.getElementById('b1').style.display = "none";
	document.getElementById('b1-unit').className = "";
	document.getElementById('c1').style.display = "none";
	document.getElementById('c1-unit').className = "";
	document.getElementById('d2').style.display = "none";
	document.getElementById('d2-unit').className = "";
}