/* -----------------  TOGGLE VISIBILITY  --------------- */

function toggleViz(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display != 'none' ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = 'block';
	}
}
function showDiv(div_id) {
    document.getElementById(div_id).style.display = 'block';
}
function hideDiv(div_id) {
    document.getElementById(div_id).style.display = 'none';
}