function getcookie(cookiename) {
 var cookiestring=""+document.cookie;
 var index1=cookiestring.indexOf(cookiename);
 if (index1==-1 || cookiename=="") return ""; 
 var index2=cookiestring.indexOf(';',index1);
 if (index2==-1) index2=cookiestring.length; 
 return unescape(cookiestring.substring(index1+cookiename.length+1,index2));

}
function setcookie(name,value){
cookiestring=name+"="+escape(value)
document.cookie=cookiestring;
if(!getcookie(name)){
return false;
}
else{
return true;
}
}
function ladenCookie(bestand){
if(getcookie(bestand)){
nummer = getcookie(bestand)
wissel(nummer)
}
}