function showHideContentDiv (state) {
	//alert ('showHideContentDiv');
	var newDisplay = (state == 'hidden') ? 'none' : 'block';
	try {
		if (document.getElementById ('leftMenu')) {
			document.getElementById ('leftMenu').style.visibility = state;
			document.getElementById ('leftMenu').style.display = newDisplay;
		}
		else {
			alert ('No left menu found');
		}
		if (document.getElementById ('horizontalMenu')) {
			document.getElementById ('horizontalMenu').style.visibility = state;
			document.getElementById ('horizontalMenu').style.display = newDisplay;
		}
		else {
			alert ('No horizontal menu found');
		}
		if (document.getElementById ('mainContent')) {
			document.getElementById ('mainContent').style.visibility = state;
			document.getElementById ('mainContent').style.display = newDisplay;
		}
		else {
			alert ('No main content found');
		}
		if (document.getElementById ('mainTitle')) {
			document.getElementById ('mainTitle').style.visibility = state;
			document.getElementById ('mainTitle').style.display = newDisplay;
		}
		else {
			alert ('No main title found');
		}
		if (document.getElementById ('logoSwf')) {
			document.getElementById ('logoSwf').style.visibility = state;
			document.getElementById ('logoSwf').style.display = newDisplay;
		}
		else {
			alert ('No logo found');
		}
	}
	catch (e) {
		alert ('showHideContentDiv failed : ' + e.name + ':' + e.message);
	}
}