function open_main(pfad,winname,breite,hoehe) {
         
          var options = "width="+ breite + ",height=" + hoehe + ",scrollbars=no,status=no,resizable=1,location=no,toolbar=no,left=456,top=200,screenX=456,screenY=200";
          pictureWindow = window.open(pfad,winname,options);
          
         if ((navigator.appName == "Netscape") && (navigator.appVersion.charAt(0) !="2") && (navigator.appVersion.substring(0,5) != "4.0b1"))
             ok = true;
          else ok = false;
  }
 function open_pop(pfad,winname,breite,hoehe) {
         
          var options = "width="+ breite + ",height=" + hoehe + ",scrollbars=yes,status=no,resizable=1,location=no,toolbar=no,left=456,top=200,screenX=456,screenY=200";
          pictureWindow = window.open(pfad,winname,options);
          
         if ((navigator.appName == "Netscape") && (navigator.appVersion.charAt(0) !="2") && (navigator.appVersion.substring(0,5) != "4.0b1"))
             ok = true;
          else ok = false;
  }
  function open_guest(pfad,winname,breite,hoehe) {
         
          var options = "width="+ breite + ",height=" + hoehe + ",scrollbars=yes,status=no,resizable=1,location=no,toolbar=no,left=200,top=200,screenX=200,screenY=200";
          pictureWindow = window.open(pfad,winname,options);
          
         if ((navigator.appName == "Netscape") && (navigator.appVersion.charAt(0) !="2") && (navigator.appVersion.substring(0,5) != "4.0b1"))
             ok = true;
          else ok = false;
  }
  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) { //v3.0
  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); 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 pruefen() {
var name = document.forms[0].name.value;
var email = document.forms[0].email.value;
var nachricht = document.forms[0].nachricht.value;

if(name == "") {
alert("Bitte geben Sie Ihren Namen an");
document.forms[0].name.focus();return false;
}
if(email == "") {
alert("Bitte geben Sie Ihre E-Mail-Adresse an");
document.forms[0].email.focus();return false;
}
if(document.forms[0].email.value.indexOf('@') == -1) {
alert("E-Mail ohne @?");
document.forms[0].email.focus();return false;
}
if(nachricht == "") {
alert("Bitte tragen Sie Ihre Nachricht ein");
document.forms[0].nachricht.focus();return false;
}
}