var currentSelectedLetter = "A";

function displayLetter(letter) {
	// Hide old
	var divOldLetter = document.getElementById("linecard-"+currentSelectedLetter);
	if (divOldLetter) {
		divOldLetter.style.display = "none";
	}
	var buttonOldLetter = document.getElementById("letter-"+currentSelectedLetter);
	if (buttonOldLetter) {
		buttonOldLetter.className = "letter";
		buttonOldLetter.onMouseOver = function() { buttonOldLetter.className='letter'; };
		buttonOldLetter.onMouseOut = function() { buttonOldLetter.className='letterOver'; };
	}

	// Show new
	var divNewLetter = document.getElementById("linecard-"+letter);
	if (divNewLetter) {
		divNewLetter.style.display = "";
	}
	var buttonNewLetter = document.getElementById("letter-"+letter);
	if (buttonNewLetter) {
		buttonNewLetter.className = "currentLetter";
		buttonNewLetter.onMouseOver = function() { return false; };
		buttonNewLetter.onMouseOut =  function() { return false; };
	}
	
	// Update flag
	currentSelectedLetter = letter;
}

function changeClass(letter, className) {
	if (letter!=currentSelectedLetter) {
		var buttonLetter = document.getElementById("letter-"+letter);
		if (buttonLetter) {
			buttonLetter.className = className;
		}
	}
}