function gotoMenu(menuName) {
	var menus = new Array('spielgeraete', 'ueber_uns','bruecken_und_stege','laermschutz','individueller','parkausstattung','holz_garten',
						  'fit_sitz','kontakt');
	for (var i = 0; i < menus.length; ++i)
 		 $(menus[i]).hide();
	if($('mainMenu').hide())
	$(menuName).show();
	return;
}

function gotoMainMenu() {
	var menus = new Array('spielgeraete', 'ueber_uns','bruecken_und_stege','laermschutz','individueller','parkausstattung','holz_garten',
						  'fit_sitz','kontakt');
	for (var i = 0; i < menus.length; ++i)
 		 $(menus[i]).hide();
	$('mainMenu').show();
	return;
}