function rand_num(min,max){
		

        zahl = min + parseInt( Math.random() * ( max-min+1 ));
		if(zahl < 10){
		zahl_str = '0' + zahl.toString();
		} else {
		zahl_str = zahl.toString();
		}

return zahl_str;
}

function cookie_lesen_alt (cookname) {
  var Wert = false;
  if (document.cookie.substring(cookname)) {
    var Wertstart = document.cookie.indexOf("=");
    var Wertende = document.cookie.indexOf(";");
    if (Wertende == -1)
      Wertende = document.cookie.length;
    Wert = document.cookie.substring(Wertstart+1, Wertende);
  }
  return Wert;
}
function cookie_lesen (n) {
	
a = document.cookie;
 res = false;
 while(a != '')
 {
  while(a.substr(0,1) == ' '){a = a.substr(1,a.length);}
  cookiename = a.substring(0,a.indexOf('='));
  if(a.indexOf(';') != -1)
  {cookiewert = a.substring(a.indexOf('=')+1,a.indexOf(';'));}
  else{cookiewert = a.substr(a.indexOf('=')+1,a.length);}
  if(n == cookiename){res = cookiewert;}
  i = a.indexOf(';')+1;
  if(i == 0){i = a.length}
  a = a.substring(i,a.length);
 }
 
return(res)

}

function cookie_setzen (Bezeichner, Wert, Verfall) {
  var jetzt = new Date();
  var Auszeit = new Date(jetzt.getTime() + Verfall);
  document.cookie = Bezeichner + "=" + Wert + "; expires=" + Auszeit.toGMTString() + ";";
}