var t;
  function fixheight() {
  
   /*
    var bg_bottom = document.getElementById("bg_bottom");
    bg_bottom.style.top = "0px";
    */
  
   var maxH = 0;
   var ids = ["nav_block","bilderreihe","content_block"];
   for (var i=0;i<ids.length;i++) {
    var d = document.getElementById(ids[i]);
    d.style.height = ""; 
    
    var dOff = parseInt(d.offsetHeight); 
    if (i == 2 && !document.all) {
      try { 
        
        var cnt = document.getElementById('content');
        var oldDisplay = cnt.style.display; 
        cnt.style.display = 'table';
        var cntHeight = cnt.offsetHeight+33;
        cnt.style.display = oldDisplay;
        
        console.log(cntHeight+70, window.innerHeight); 
        
        if (window.innerHeight < cntHeight && cntHeight > maxH) {
         dOff = dOff+70; 
        }
        
      } catch (e) { }
     
    }    
    if (dOff > maxH) maxH = dOff;
   }

   for (var i=0;i<ids.length;i++) {
    var d=document.getElementById(ids[i]);
    d.style.height = maxH+"px";
   }
   
   var bg_bottom = document.getElementById("bg_bottom");
   bg_bottom.style.top = (maxH-70)+"px";
   
  }