function adapt_columns(){
  if(document.getElementById('contents').offsetHeight){
    var div_heights = new Array(
    document.getElementById('contents').offsetHeight,
    document.getElementById('side_menue').offsetHeight,
    document.getElementById('rechts').offsetHeight
    );
    div_heights = div_heights.reverse(div_heights.sort(num_sort));
    var style_height = div_heights[0] + "px";
    document.getElementById('contents').style.height = style_height;
    document.getElementById('side_menue').style.height = style_height;
    document.getElementById('rechts').style.height = style_height;
  }
  }

function num_sort(a,b){
    return a-b;
  }
  
function init_nav(){
     for(i=0; i < document.getElementsByTagName('ul').length; i++){
          if(document.getElementsByTagName('ul')[i].className == "opened"){
             var id=document.getElementsByTagName('ul')[i].parentNode.id;
           toggle(id, false);
           }
        }
        if(window.name.length > 0) load_nav();
    }
    
function toggle(id, save){
     ul="ul_" + id;
     img="img_" + id;
     ul_element=document.getElementById(ul);
     img_element=document.getElementById(img);
     if(ul_element){
            if(ul_element.className == 'closed'){
            ul_element.className = "opened";
            img_element.src = "./images/opened.gif";
    }
    else {
       ul_element.className = "closed";
       img_element.src = "./images/folder.gif";
       }
    }
    if(save == true) save_nav();
    }
    
function save_nav(){
     var save = "";
     for(var i=0; i < document.getElementsByTagName('ul').length; i++){
         if((document.getElementsByTagName('ul')[i].className == "opened" || document.getElementsByTagName('ul')[i].className == "closed") && document.getElementsByTagName('ul')[i].id != "root"){
          save = save + document.getElementsByTagName('ul')[i].id + "=" + document.getElementsByTagName('ul')[i].className + ",";
        }
        }
        if(save.lastIndexOf(",") > 0) save = save.substring(0, save.lastIndexOf(","));
      window.name = save;
    }
    
function load_nav(){
	var items=window.name.split(",");
     for(var i=0; i < items.length; i++){
          id_value=items[i].split("=");
          if(id_value.length == 2){
            id = id_value[0];
            value = id_value[1];
            document.getElementById(id).className = value;
            img = "img_" + id.substring(3, id.length);
            var img_element = document.getElementById(img);
        
            if(value == "closed")
                 img_element.src = "./images/folder.gif";
            else img_element.src = "./images/opened.gif";
      
          }
     }
}

function bigbild(str_url,v_name,v_width,v_height){
window.open(str_url,v_name,"width=" + v_width + ",height=" + v_height + ",toolbar=no,scrollbars=no,resizable=no,menubar=no");
}