function opensubmenu(i){
    var submenu=document.getElementById("subnav"+i);
    var box=document.getElementById("box"+i)    
        if (submenu) {
            submenu.style.display="block";
            box.className="box sub";
        }
    }
    
    function closesubmenu(i){
    var box=document.getElementById("box"+i);        
    var submenu=document.getElementById("subnav"+i);    
        if (submenu) {
            submenu.style.display="none";
            box.className="box";

        }
    }
    
    function fixsize(){
        var innernext=document.getElementById('innernext');
        var innernext_text=document.getElementById('innernext_text');
        var right_next=document.getElementById('right_next');
        
        var innercontent=document.getElementById('innercontent');
        var koppel_home=document.getElementById('koppel_home');
        var right_side=document.getElementById('right_side');
        
        var intro = document.getElementById("intro");                             
        var kolom1 = document.getElementById("koppelboxkolom1");
        var kolom2 = document.getElementById("koppelboxkolom2");
        var kolom3 = document.getElementById("koppelboxkolom3");
              
        if(innercontent && koppel_home){
            var max_homeheight=Math.max(innercontent.offsetHeight,koppel_home.offsetHeight);            
            if(max_homeheight < right_side.offsetHeight){
                koppel_home.style.height=right_side.offsetHeight-5+"px";
                innercontent.style.height=right_side.offsetHeight-5+"px";
            } else {
                koppel_home.style.height=max_homeheight+"px";
                innercontent.style.height=max_homeheight+"px";
            }
        }
        if((kolom1 || kolom2 || kolom3) && innernext_text){
            var kolom1_height=0;
            var kolom2_height=0;
            var kolom3_height=0;
            var intro_height=0;                                                  
            if(kolom1){
               kolom1_height=kolom1.offsetHeight;
            }
            if(kolom2){
               kolom2_height=kolom2.offsetHeight;
            }
            if(kolom3){
               kolom3_height=kolom3.offsetHeight;
            }
                   
            if(intro){
               intro_height=intro.offsetHeight;
            }                                      
                              
           var max_heightstartpagina=Math.max(kolom1_height+intro_height,kolom2_height+intro_height,kolom3_height+intro_height,innernext_text.offsetHeight);
           innernext_text.style.height=max_heightstartpagina+23+"px";           
        }
        
        if(innernext_text && innernext){
            var max_nextheight=Math.max(innernext_text.offsetHeight,innernext.offsetHeight);         
            innernext_text.style.height=max_nextheight+"px";
            innernext.style.height=(max_nextheight+25)+"px";  
        }
        
        var maxheight_menu= 0;
        for (var i=1;i<6;i++){
          if(document.getElementById("box"+i)){
           if(document.getElementById("box"+i).offsetHeight > maxheight_menu){
                 maxheight_menu=document.getElementById("box"+i).offsetHeight;
            } 
          }            
        }
        for (var i=1;i<6;i++){
           if(document.getElementById("box"+i)){
              document.getElementById("box"+i).style.height=maxheight_menu+"px";
           } 
        }
   }