function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function extLink(www,ziel){
  var xp = (screen.availWidth-650)/2;
  var yp = (screen.availHeight-500)/2;
	extFenster = window.open(www,ziel,"width=550,height=650,left="+xp+",top="+yp+",toolbar=yes,location=yes,status=yes,scrollbars=yes");
	extFenster.focus()
	return false
}

function check(){
  var ok = true;
  var msg = "";
 
  if (!document.daten.von_name.value) {
    ok = false;
	msg += "Bitte Ihren Namen angeben.\n";
  }

  if (!document.daten.von_eMail.value) {
    ok = false;
	msg += "Bitte eMail-Adresse angeben.\n";
  }
  
  var reg = /.+@.+\..+/;
  if (document.daten.von_eMail.value && !reg.exec(document.daten.von_eMail.value)) {
      ok = false;
	  msg += "Bitte kontrollieren Sie die eMail-Adresse.\n";
  }
   if (!document.daten.nachricht.value) {
    ok = false;
	msg += "Bitte Ihre Nachricht eintragen.\n";
  }
    
  if(!ok)
   alert(msg)
  
  return(ok)
  
}