function hideTRElement (elementId) {
	var element;
	if (document.all)
		element = document.all[elementId];
	else if (document.getElementById)
		element = document.getElementById(elementId);
	if (element && element.style)
		element.style.display = 'none';
}

function showTRElement (elementId) {
	var element;
	if (document.all)
		element = document.all[elementId];
	else if (document.getElementById)
		element = document.getElementById(elementId);
	if (element && element.style)
		element.style.display = '';
}