function showHide(shID) {
    if (document.getElementById(shID)) {
	if (document.getElementById(shID+'-show').style.display != 'none') {
	    document.getElementById(shID+'-show').style.display = 'none';
	    document.getElementById(shID).style.display = 'block';
	}
	else {
	    document.getElementById(shID+'-show').style.display = 'inline';
	    document.getElementById(shID).style.display = 'none';
	}
    }
}