function alert_popper(txt)
{
   var pop=document.getElementById("popper");

   posx=250;
   posy=300;

   if (txt.indexOf("alsch")>0) {
        color="#ff0000";
        talign="center";
        height=50;
   } else {
        color="#00aa00";
        talign="left";
        height=150;
   }

   pop.style.left=posx+"px";
   pop.style.top=posy+"px";
   pop.style.height=height+"px";
   pop.style.textAlign=talign;
   pop.style.display="block";
   pop.visibility="visible";
   pop.style.border="2px solid "+color;

   txt+="<br/><br/><center><b>Fenster schlie&szlig;en</b></center>";

   pop.innerHTML=txt;

}


function popperClose()
{
   var pop=document.getElementById("popper");
   pop.style.display="none";
   pop.style.visibility="invisible";
}