function toggleDisplayHide(zone1,zone2){

    toggleDisplay(zone1);

    toggleHide(zone2);

}

function toggleDisplay(zone){

	var lyr = document.getElementById(zone);
	
	if(lyr.style.display=='none'){

		lyr.style.display='block';

	}

}



function toggleHide(zone){

	var lyr = document.getElementById(zone);

	if(lyr.style.display=='block'){

		lyr.style.display='none';

	}

}