function unhide(id, plussign){
	var theRow = document.getElementById(id);
	var theImage = document.getElementById(plussign);
	if (theRow.style.display=="none") {
        theRow.style.display = "";
        theImage.src = "img/arrow_down.gif";
    } else {
        theRow.style.display = "none";
        theImage.src = "img/arrow_next.gif";
    }
}