var agt = navigator.userAgent.toLowerCase();
	// Browser
	var ie4 = (document.all) ? true : false;
	var ie5 = (document.getElementById && document.all) ? true : false;
	var ie6 = (document.getElementById && document.all && (navigator.appVersion.indexOf('MSIE 6.')!= -1)) ? true : false;
	
	var vers_major = parseInt(navigator.appVersion);
    var vers_minor = parseFloat(navigator.appVersion);

	var ns4 = (document.layers) ? true : false;
	var ns478 = (ns4 && vers_minor == 4.78)  ? true : false;
	var ns6 = (document.getElementById && !document.all) ? true : false;
	
	var opera = (agt.indexOf('opera') != -1) ? true : false;

	var temp = null;
	var menuid = null;
    var buttonid = null;
	
	function menu_toggle(id) {
	
		if (buttonid)
				var dohide = (buttonid != menuid) ? true : false;
	
		if(ns6){ // ns ab version 6 und mozilla
			if(dohide)	
				document.getElementById(buttonid).style.display='none';
			document.getElementById(id).style.display = '';
			// alert('NS6');
		}else if(ie5){
			if(dohide)	
				document.getElementById(buttonid).style.display='none';
			document.getElementById(id).style.display = '';
			// alert('IE5');
		} else if(ie4){
			if(dohide) 
				document.all[buttonid].style.visibility = 'hidden';
			document.all[id].style.visibility = 'show';
			// alert('IE4');
		}
		buttonid = id;
	}