function ToggleVisible( show, hide ) {
    var s = document.getElementById(show);
    var h = document.getElementById(hide);
    if( s ) {
	s.style.display = "block";
    }
    if( h ) {
	h.style.display = "none";
    }
}

function ToggleVisibleThree( show, hide1, hide2 ) {
    var s = document.getElementById(show);
    var h1 = document.getElementById(hide1);
    var h2 = document.getElementById(hide2);
    if( s ) {
	s.style.display = "block";
    }
    if( h1 ) {
	h1.style.display = "none";
    }
    if( h2 ) {
	h2.style.display = "none";
    }
}

function ToggleSpan( show, hide ) {
    var s = document.getElementById(show);
    var h = document.getElementById(hide);
    if( s ) {
	s.style.display = "inline";
    }
    if( h ) {
	h.style.display = "none";
    }
}

function Toggle( elem ) {
    var e = document.getElementById(elem);
    if( e ) {
	if( e.style.display == 'none' ) {
	    e.style.display = 'block';
	} else {
	    e.style.display = 'none';
	}
    }
}