var shown = 0;

function frame_off() {
	if(document.getElementById('frame_abc') != null && document.getElementById('frame_abc').style.visibility == "visible" && ++shown > 1) {
		document.getElementById('frame_abc').style.visibility = "hidden"
		shown = 0
	} else {
		if(document.getElementById('table_date') != null && document.getElementById('table_date').style.visibility == "visible" && ++shown > 1) {
			document.getElementById('table_date').style.visibility = "hidden"
			shown = 0
		}
	}
}