function showNavigationBar(s) {

	var obj = document.getElementById("navigationbar");

	if (s == 'on') {
		obj.style.height		= '30px';
		obj.style.position		= 'relative';
		obj.style.visibility	= 'visible';
	} else if (s == 'off') {
		obj.style.height		= '1px';
		obj.style.position		= 'absolute';
		obj.style.visibility	= 'hidden';
	}

}

function showBackbutton(s) {

	var obj = document.getElementById("back_button");

	if (s == 'on') {
		obj.style.visibility	= 'visible';
	} else if (s == 'off') {
		obj.style.visibility	= 'hidden';
	}

}

function load(s) {
	if (s == 'on') {
		document.getElementById('loading').style.visibility = 'visible';
	} else if (s == 'off') {
		document.getElementById('loading').style.visibility = 'hidden';
	}
}