GECKO = document.getElementById? 1:0 ;
			NS = document.layers? 1:0 ;
			IE = document.all? 1:0 ;
			function haupt(untermenue)
			{
			var zustand = '';
			if (NS)
				{
					zustand = document.layers(untermenue).style.display;
				}
				else if (IE)
				{
					zustand = document.all(untermenue).style.display;
				}
				else if (GECKO)
				{
					zustand = document.getElementById(untermenue).style.display;
				}
				switchen(untermenue,zustand);
			}
			function switchen(untermenue,zustand)
			{
				var hauptmenues = new Array('Gitarre','Flöte','Keyboard');
				for (var menue in hauptmenues)
				{
					var das_menue = hauptmenues[menue];
					if (GECKO) {document.getElementById(das_menue).style.display = 'none';}
					else if (NS) {document.layers[das_menue].style.display = 'none';}
					else if (IE) {document.all[das_menue].style.display = 'none';}
				}
				if (zustand=='none')
				{
					aufklappen(untermenue);
				}
			}
			function aufklappen(untermenue)
			{
				if (GECKO) {document.getElementById(untermenue).style.display = 'block';}
				else if (NS) {document.layers[untermenue].style.display = 'block';}
				else if (IE) {document.all[untermenue].style.display = 'block';}
			}