function poppup(ID,inhalt) {
document.write("<div id=\""+ID+"\" style=\"text-align:center;vertical-align:middle;background-image:url(bt50.png);position:absolute;top:0;left:0;z-index:100000;width:"+screen.availWidth+";height:"+screen.availHeight+";text-align:center;visibility:hidden;\"><div style=\"background:white;position:absolute;top:"+(screen.availHeight/2-250)+";left:"+(screen.availWidth/2-300)+";z-index:100001;width:550;padding:25;border: 1px solid black;\">"+inhalt+"<BR><BR><input onclick=\"document.getElementById('"+ID+"').style.visibility='hidden';\" type=\"button\" value=\"OK\" /></div></div>");
}