function showElementById (id) {
	setVisibilityByid(id, 1);
}

function hideElementById (id) {
	setVisibilityByid(id, 0);
}

function setVisibilityByid (id, isVisible) {
	var element;
	var visibilityValue;
	
	if (document.getElementById) {
		element = document.getElementById(id);
	} else {
		element = document.all[id];
	}

	if (isVisible) {
		visibilityValue = 'visible';
	} else {
		visibilityValue = 'hidden';
	}
	element.style.visibility=visibilityValue;
}