function setText(textID, text) {
	var id = document.getElementById(textID);

	if (id.value == text)
		id.value = "";
	else if (id.value == "")
	    id.value = text;
}
function changeImage(img, src) {
    img.src = src;
}
function revertImage(img, src) {
    img.src = src;
}