var mpr = 'Seitenvorschau';
 var mcpr = 'Seitenvorschau schließen';
 var psize = '350';
 
 function pv(url, id) {
   if(document.all || document.getElementById) {
     document.write('<a href="'+url+'" id="lk'+id+'" onClick="pview(this);return false" class="sub">'+mpr+'</a>');
   }
 }
 
 function pview(link) {
 
   var ie4 = (document.all && !document.getElementById) ? true : false;
 
   if (ie4 == 1) {
     var iframe = document.all['if'+link.id];
   }
   else {
     var iframe = document.getElementById('if'+link.id);
   }
 
   if(link.innerHTML == mpr) {
     if(iframe) {
       iframe.src = link.href;
       iframe.style.height = psize;
       iframe.style.visibility = 'visible';
     } else {
       myBR = document.createElement('br');
       myBR.setAttribute('id','br'+link.id);
       link.parentNode.appendChild(myBR);
       myIframe = document.createElement('iframe');
       myIframe.setAttribute('id','if'+link.id);
       myIframe.setAttribute('width','95%');
       myIframe.setAttribute('height',psize);
       myIframe.setAttribute('src',link.href);
       link.parentNode.appendChild(myIframe);
     }
     //link.innerText = mcpr;
     link.innerHTML = mcpr;
   } else if(iframe) {
     if (ie4 == 1) {
       myBR = document.all['br'+link.id];
     } else {
       myBR = document.getElementById('br'+link.id);
     }
     link.innerHTML = mpr;
     link.parentNode.removeChild(iframe);
     link.parentNode.removeChild(myBR);
   }
 }
 
 function CollapseMenu(obj)
 { 
  var el = document.getElementById(obj);
  if(el.style.display == "none"){
  el.style.display = "block";
  }else{
  el.style.display = "none";
  }
 }