function do_login(init) {
	if (init) {
		setto = getCookie("wieland_login");
		if (setto) {
			if (setto == "hidden") {
				setto2 = "navigation_08_down";
			} else {
				setto2 = "navigation_08_up";		
			}
		} else {
			setto = "hidden";
			setto2 = "navigation_08_down";
		}				
	} else {	
		if (document.getElementById("loginform").className=="hidden") {
			setto = "visible";
			setto2 = "navigation_08_up";
		} else {
			setto = "hidden";
			setto2 = "navigation_08_down";
		}		
		setCookie("wieland_login",setto)
	}
	
	document.getElementById("navigation_08").className = setto2;
	document.getElementById("loginform").style.visibility=setto;
	document.getElementById("loginform").className=setto;	
}

function getCookie(name) {
  var nameq = name + "=";
  var cookie_array = document.cookie.split(';');
  for (var i=0; i<cookie_array.length; i++) {
    var cookie = cookie_array[i];
    while (cookie.charAt(0)==' ') {
        cookie = cookie.substring(1,cookie.length);
    }
    if (cookie.indexOf(nameq) == 0) {
        return unescape( cookie.substring(nameq.length, cookie.length) );
    }
  }
  return null;
}      
function setCookie(name,value,days,path,domain,secure) {
  var expires, date;
  if (typeof days == "number") {
    date = new Date();
    date.setTime( date.getTime() + (days*24*60*60*1000) );
		expires = date.toGMTString();
  }
  document.cookie = name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
} 

var aktimgtab = 1;
function changeimgtab(id) {
	document.getElementById("imgtab_"+aktimgtab).style.visibility = 'hidden';
	document.getElementById("imgtab_"+aktimgtab).style.display = 'none';
	
	document.getElementById("imgtab_"+id).style.visibility = 'visible';
	document.getElementById("imgtab_"+id).style.display = 'block';
	
	aktimgtab = id;
}