var navigationBlockArray = new Array('navDilemmas','navActeurs','navAfleveringen');



function showNavigation(navigationBlock){
	for(var i=0; i < navigationBlockArray.length; i++){
		var navigationBlockItem = navigationBlockArray[i];
		if (navigationBlockItem == navigationBlock) {
			if (document.getElementById(navigationBlock).style.visibility == 'visible') {
				document.getElementById(navigationBlock).style.visibility = 'hidden';
			} else {
				document.getElementById(navigationBlock).style.visibility = 'visible';
			}
		} else {
			document.getElementById(navigationBlockArray[i]).style.visibility = 'hidden';
		}
	}
}