function tr_mouse_over(where, flag) {
	if(flag==1) {
		memClass=where.className;
		where.className="tr_bkg_over";
	} else {
		where.className=memClass;
	}
}

function show_div(div_id) {
	var off = document.getElementById(div_id).style.display=="none";
	state = (off ? "block" : "none");
	document.getElementById(div_id).style.display = state;
}