var arrowLeftImg, arrowDownImg, arrowRotatingImg;

function PrecacheImages() {
  arrowLeftImg = new Image();
  arrowLeftImg.src = "/img/arrow-left.png";

  arrowDownImg = new Image();
  arrowDownImg.src = "/img/arrow-down.png";

  arrowRotatingImg = new Image();
  arrowRotatingImg.src = "/img/arrow-rotating.png";
}

function ExpandRow(eltName, clickedElement) {
	var rowElt = document.getElementById(eltName);
	if(rowElt != null) {
		var indicatorImage = clickedElement.firstChild;

		var currentDisplay = rowElt.style.display;
		if(currentDisplay == "table-row") {
			indicatorImage.src = arrowLeftImg.src;
			rowElt.style.display = "none";
		} else {
			indicatorImage.src = arrowDownImg.src;
			rowElt.style.display = "table-row";
		}
	}
}