function set_current_id(link) {
		document.cookie = 'activated_link='+link.id+';';
	}
	function read_current_id() {
		if (document.cookie != '') {
			var a = document.cookie;
			var cookiewert = '0';
			if (a.indexOf(';') != -1)
			{
				cookiewert = a.substring(a.indexOf('=')+1,a.indexOf(';'));
				return(cookiewert);
			}
			else
			{
				cookiewert = a.substr(a.indexOf('=')+1,a.length);
				return(cookiewert);
			}
		}
		else {
			var cookiewert = '0000';
			return(cookiewert);
		}

	}

	function reset_inactive_elements (){
		var i;
		var x = document.getElementsByTagName('li');
			for (i=0;i<x.length;i++)
			{
				if (x[i].className != 'li_nc')
				{
					x[i].className = 'li_nc';
				}
			}
	}
	function set_active_element() {
	if (read_current_id()!='0000') {
			reset_inactive_elements();
			document.getElementById(read_current_id()).className='active_link';
		}
	}

	function validated_field(valid, feld) {
	var feld = feld;
		if (valid == 'true') {
			document.getElementById(feld).style.background = "#00ff00";
		}
		else {
			document.getElementById(feld).style.background = "#ff0000";
		}

	}

	function validate_field(feld){
		fehler = 0;
		if (feld.name == 'telefon') {
			if(feld.value / 1) {
			}
			else {
				fehler++;
			}
		}
		if (feld.name == 'email') {
			 if (feld.value.search("@") == -1) {
			 	fehler++;
			 }
			 if(feld.value.indexOf(".") == -1) {
			 	fehler++;
			 }
			 if(feld.value.length < 5) {
			 	fehler++;
			 }
		}
		if (fehler > 0) {
			 validated_field('false',feld.name);
		}
		else {
			validated_field('true',feld.name);
		}
	}