function sdiv($id){
	document.getElementById($id).style.visibility="visible";
}
function hdiv($id1, $id2, $id3){
	document.getElementById($id1).style.visibility="hidden";
	document.getElementById($id2).style.visibility="hidden";
	document.getElementById($id3).style.visibility="hidden";
}

function sid($id){
	document.getElementById($id).style.visibility="visible";
}
function hid($id){
	document.getElementById($id).style.visibility="hidden";
}