var highlightIndex = 0;

function highlightBox(index) {
	if (highlightIndex > 0 && highlightIndex != index)	unhighlightBox(highlightIndex);

	var bx = document.getElementById("colorbox"+index);
	bx.style.backgroundColor='#ffffcc';
	highlightIndex = index;
}

function unhighlightBox(index) {
	var bx = document.getElementById("colorbox"+index);
	bx.style.backgroundColor='#ffffff';
	highlightIndex = 0;
}